Updated on 2024/04/24

写真a

 
FUJIWARA Hideki
 
Organization
Graduate School of Science Department of Chemistry Professor
School of Science Department of Chemistry
Title
Professor
Affiliation
Institute of Science
Contact information
メールアドレス
Affiliation campus
Sugimoto Campus

Position

  • Graduate School of Science Department of Chemistry 

    Professor  2022.04 - Now

  • School of Science Department of Chemistry 

    Professor  2022.04 - Now

Degree

  • 博士(工学) ( Kyoto University )

  • 修士(工学) ( Kyoto University )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment  / 機能材料・デバイス

  • Nanotechnology/Materials / Functional solid state chemistry  / 機能物質化学

  • Nanotechnology/Materials / Functional solid state chemistry

Research Interests

  • 物性有機化学

  • 分子性伝導体

Research subject summary

  • TTF-磁性遷移金属錯体を用いた磁性伝導体の開発

  • 光機能性部位を有するドナーを用いた光誘起伝導体の開発

  • 安定有機ラジカルを有するドナーを用いた磁性伝導体の開発

  • 折れ曲がった骨格を有するドナーを用いた磁性伝導体の開発

Research Career

  • 有機伝導体

    有機伝導体、磁性、構造解析、双極子モーメント、有機合成 

  • 色素増感太陽電池

    太陽電池、光電変換、光物性、色素分子、有機合成 

  • 光機能性材料

    有機伝導体、光機能性、構造解析、光伝導、有機合成 

  • 磁性伝導体

    有機伝導体、磁性、構造解析、安定有機ラジカル、有機合成 

Professional Memberships

  • 基礎有機化学会

    2017.06 - Now   Domestic

  • 光化学協会

    2009.01 - Now

  • 分子科学会

    2006.11 - Now

  • 日本結晶学会

    2000.09 - 2017.12

  • 日本化学会

    1996.04 - Now

  • 日本化学会

  • 基礎有機化学会

  • 分子科学会

  • 光化学協会

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Awards

  • 分子性導体チャレンジ賞 (Challenger Award 21)

    2006.06   科学研究費特定領域研究「分子性導体」  

  • BCSJ賞

    2006.04   日本化学会  

  • 平成15年度日本化学会進歩賞

    2004.03   日本化学会  

Job Career (off-campus)

  • 京都大学大学院工学研究科   非常勤講師

    2023.10 - 2024.03

  • 大阪公立大学大学院理学研究科 教授

    2022.04 - Now

  • 神戸大学大学院理学研究科   非常勤講師

    2020.10 - 2021.03

  • Osaka Prefecture University   Graduate School of Science

    2016.04 - 2022.03

  • 総合研究大学院大学数物科学研究科構造分子科学専攻助手

    2000.04 - 2003.09

  • 岡崎国立共同研究機構分子科学研究所分子集団研究系助手

    1996.04 - 2003.09

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Papers

  • Solvent-free synthesis and chiroptical properties of a C-N axially chiral cruciform dimer of benzo[b]phenoxazine. Reviewed

    Ishikawa S, Sakamaki D, Gon M, Tanaka K, Fujiwara H

    Chemical communications (Cambridge, England)   2024.04( ISSN:1359-7345

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1039/d4cc00977k

    PubMed

  • Synthesis, Structures, Electrochemical and Optical Properties of Vinyl-Extended Tetrathiafulvalene Derivatives Functionalized with Two 2,6-Dicyano-λ<sup>5</sup>-Phosphinine Units Reviewed

    Misaki T.

    European Journal of Organic Chemistry   27 ( 13 )   2024.04( ISSN:1434193X

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1002/ejoc.202400088

  • A Dicyanomethyl Radical Conjugated with a Pyridylamino Group: Combining Radical-based Dynamic Covalent Chemistry and Coordination Chemistry Reviewed

    H. Hasegawa, D. Sakamaki, H. Fujiwara

    Angewandte Chemie - International Edition   62 ( 26 )   e202302498   2023.06( ISSN:14337851

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1002/anie.202302498

    PubMed

  • A double heterohelicene composed of two benzo[b]phenothiazine exhibiting intense room-temperature circularly polarized phosphorescence Reviewed

    S. Tanaka, D. Sakamaki, N. Haruta, T. Sato, M. Gon, K. Tanaka, H. Fujiwara

    Journal of Materials Chemistry C   11 ( 14 )   4846 - 4854   2023.03

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1039/d3tc00871a

  • Unveiling a new aspect of oxocarbons: open-shell character of 4- and 5-membered oxocarbon derivatives showing near-infrared absorption Reviewed

    Takeshi Maeda, Taishi Oka, Daisuke Sakamaki, Hideki Fujiwara, Naoya Suzuki, Shigeyuki Yagi, Tatsuki Konishi, Kenji Kamada

    Chemical Science   14 ( 8 )   1978 - 1985   2023.01( ISSN:20416520

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1039/D2SC06612B

    PubMed

  • Preparation and properties of novel hetero-halogen complexes Reviewed

    Yuji Nishidai, Toshiki Kawabata, Kotaro Yubata, Fumiya Ota, Hiroki Takamiya, Hideki Fujiwara, Hiroshi Matsubara

    Tetrahedron   119   2022.07( ISSN:00404020

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1016/j.tet.2022.132854

  • Synthesis, Photophysical and Electrochemical Properties of Bis‐Squaraine Dyes Fused on Isomeric Benzodipyrrole Central Units (Chem. Asian J. 13/2022) Reviewed International coauthorship

    Ryuhei Sawada, Takeshi Maeda, Yuya Oda, Shigeyuki Yagi, Venugopal Karunakaran, Hideki Fujiwara, Ayyappanpillai Ajayaghosh

    Chemistry – An Asian Journal   2022.07

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:International journal  

    DOI: 10.1002/asia.202200385

  • A dicyanomethyl radical stabilized by ferrocene: a new building block for radical-based dynamic covalent chemistry with redox activity

    Misato Ishimoto, Daisuke Sakamaki, Hideki Fujiwara

    Chemical Communications   58 ( 21 )   3553 - 3556   2022.03( ISSN:1359-7345

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/d1cc07253f

    PubMed

  • Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors

    R. Ramazashvili, P. D. Grigoriev, T. Helm, F. Kollmannsberger, M. Kunz, W. Biberacher, E. Kampert, H. Fujiwara, A. Erb, J. Wosnitza, R. Gross, M. V. Kartsovnik

    npj Quantum Materials   6 ( 1 )   2021.12( ISSN:2397-4648

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    Publishing type:Research paper (scientific journal)  

    <jats:title>Abstract</jats:title><jats:p>Most of solid-state spin physics arising from spin–orbit coupling, from fundamental phenomena to industrial applications, relies on symmetry-protected degeneracies. So does the Zeeman spin–orbit coupling, expected to manifest itself in a wide range of antiferromagnetic conductors. Yet, experimental proof of this phenomenon has been lacking. Here we demonstrate that the Néel state of the layered organic superconductor <jats:italic>κ</jats:italic>-(BETS)<jats:sub>2</jats:sub>FeBr<jats:sub>4</jats:sub> shows no spin modulation of the Shubnikov–de Haas oscillations, contrary to its paramagnetic state. This is unambiguous evidence for the spin degeneracy of Landau levels, a direct manifestation of the Zeeman spin–orbit coupling. Likewise, we show that spin modulation is absent in electron-doped Nd<jats:sub>1.85</jats:sub>Ce<jats:sub>0.15</jats:sub>CuO<jats:sub>4</jats:sub>, which evidences the presence of Néel order in this cuprate superconductor even at optimal doping. Obtained on two very different materials, our results demonstrate the generic character of the Zeeman spin–orbit coupling.</jats:p>

    DOI: 10.1038/s41535-021-00309-6

  • Double Heterohelicenes Composed of Benzo[b]- and Dibenzo[b,i]phenoxazine: A Comprehensive Comparison of Their Electronic and Chiroptical Properties

    Daisuke Sakamaki, Shunya Tanaka, Katsuki Tanaka, Mayu Takino, Masayuki Gon, Kazuo Tanaka, Takashi Hirose, Daichi Hirobe, Hiroshi M. Yamamoto, Hideki Fujiwara

    The Journal of Physical Chemistry Letters   9283 - 9292   2021.09

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.jpclett.1c02896

  • Organic Conductors with Narrow Bandwidth Based on 2-(Pyran-4-ylidene)-1,3-dithiole

    Takashi Shirahata, Masahide Ikeda, Hiroshi Watadzu, Hideki Fujiwara, Takashi Maruyama, Tokio Yamabe, Yohji Misaki

    Bulletin of the Chemical Society of Japan   94 ( 4 )   1331 - 1339   2021.04( ISSN:1348-0634

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/bcsj.20200406

  • Organic Conductors with Narrow Bandwidth Based on 2-(Pyran-4-ylidene)-1,3-dithiole Reviewed

    T. Shirahata, M. Ikeda, H. Watadzu, H. Fujiwara, T. Maruyama,T. Yamabe, Y. Misaki

    Bull. Chem. Soc. Jpn. 雑誌   94 ( 4 )   1331 - 1339   2021.04

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    Kind of work:Joint Work  

  • Synthesis and Electronic Properties of Directly Linked Dihydrodiazatetracene Dimers

    Katsuki Tanaka, Daisuke Sakamaki, Hideki Fujiwara

    Chemistry – A European Journal   27 ( 13 )   4430 - 4438   2021.03( ISSN:1521-3765

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/chem.202005005

  • Synthesis and Physical Properties of Tetrathiafulvalene-8-Quinolinato Zinc(II) and Nickel(II) Complexes

    Keijiro Tsujimoto, Shinya Yamamoto, Hideki Fujiwara

    Inorganics   9 ( 2 )   11 - 11   2021.02

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/inorganics9020011

  • Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors Reviewed

    R. Ramazashvili, P. D. Grigoriev, T. Helm, F. Kollmannsberger, M. Kunz, W. Biberacher, E. Kampert, H. Fujiwara, A. Erb, J. Wosnitza, R. Gross, M. V. Kartsovnik

    npj Quantum Materials 雑誌 Nature publishing   6   2021.02

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    Kind of work:Joint Work  

  • Synthesis and Physical Properties of Tetrathiafulvalene-8-Quinolinato Zinc(II) and Nickel(II) Complexes Reviewed

    K. Tsujimoto, S. Yamamoto, H. Fujiwara

    Inorganics 雑誌 MDPI   9   2021.02

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    Kind of work:Joint Work  

  • Synthesis and Electronic Properties of Directly Linked Dihydrodiazatetracene Dimers Reviewed

    K. Tanaka, D. Sakamaki, H. Fujiwara

    Chem. Eur. J. 雑誌 Wiley VCH   27   4430 - 4438   2021.01

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  • Photophysical properties of 4-(5-methylthiophen-2-yl)pyridinium–cyclic enolate betaine dyes tuned by control of twisted intramolecular transfer

    Yuichiro Hayashi, Naoya Suzuki, Takeshi Maeda, Hideki Fujiwara, Shigeyuki Yagi

    New Journal of Chemistry   45 ( 22 )   9770 - 9779   2021( ISSN:1144-0546

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    Publishing type:Research paper (scientific journal)  

    In this paper, thienylpyridinium-cyclic enolate betaine (TPB) dyes were reported as unique skeletons of fluorescent donor-acceptor type molecules. TPB derivatives with five-membered cyclic enolates are coplanar because of the intramolecular hydrogen bond formation between the carbonyl oxygens of the cyclic enolate and the α-hydrogens of the pyridinium ring. However, a six-membered cyclic enolate leads to a pre-twisted structure due to the steric hindrance. TPB derivatives with alkylene-bridged cyclic enolates exhibited obvious fluorescence quenching through the twisted intramolecular charge transfer (TICT) process in solution. In contrast, electron-deficient cyclic enolates suppressed the TICT process, and thus relatively intense emission was observed. This report also discusses deactivation processes in the excited state of each TPB derivative by theoretical calculations to support the experimental results. These observations present a rational design strategy to control the TICT of TPB derivatives.

    DOI: 10.1039/D1NJ00714A

  • Tetrathiafulvalene‐Inserted Diphenoquinone: Synthesis, Structure, and Dynamic Redox Property

    Misaki Mitsuoka, Daisuke Sakamaki, Hideki Fujiwara

    Chemistry – A European Journal   26 ( 62 )   14144 - 14151   2020.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/chem.202002291

  • Hydrogen bond-rigidified planar squaraine dye and its electronic and organic semiconductor properties Reviewed

    T. Maeda, A, Liess, A. Kudzus, A.-M. Krause, M. Stolte, H. Amitani, S. Yagi, H. Fujiwara, F. Würthner

    Chem. Commun. 雑誌 Royal Society of Chemistry   56   9890 - 9893   2020.07

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    Kind of work:Joint Work  

  • A Tetrathiafulvalene‐inserted Diphenoquinone: Synthesis, Structure and Dynamic Redox Property Reviewed

    M. Mitsuoka, D. Sakamaki, H. Fujiwara

    Chem. Eur. J. 雑誌 Wiley VCH   2020.06

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  • Hydrogen bond-rigidified planar squaraine dye and its electronic and organic semiconductor properties

    Takeshi Maeda, Andreas Liess, Astrid Kudzus, Ana-Maria Krause, Matthias Stolte, Hitoshi Amitani, Shigeyuki Yagi, Hideki Fujiwara, Frank Würthner

    Chemical Communications   56 ( 68 )   9890 - 9893   2020( ISSN:1359-7345

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    <p>The one-step reaction of a dicyanovinyl-functionalized squaric acid with Fischer bases afforded <italic>C</italic><sub>2v</sub> symmetric squaraine dyes with rigid planar structures due to intramolecular N–H⋯O hydrogen bonds.</p>

    DOI: 10.1039/D0CC04306K

    PubMed

  • Extreme multi-point van der Waals interactions: isolable dimers of phthalocyanines substituted with pillar-like azaacenes Reviewed

    H. Saeki, D. Sakamaki, H. Fujiwara, S. Seki

    Chemical Science 雑誌 Royal Society of Chemistry   10   8939 - 8943   2019.08

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    Kind of work:Joint Work  

  • Magnetic properties of honeycomb-based spin models in verdazyl-based salts

    S. Miyamoto, Y. Iwasaki, N. Uemoto, Y. Hosokoshi, H. Fujiwara, S. Shimono, H. Yamaguchi

    Physical Review Materials   3 ( 6 )   2019.06( ISSN:2475-9953

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/physrevmaterials.3.064410

  • Magnetic properties of honeycomb-based spin models in verdazyl-based salts Reviewed

    S. Miyamoto, Y. Iwasaki, N. Uemoto, Y. Hosokoshi, H. Fujiwara, S. Shimono, and H. Yamaguchi

    Phys. Rev. Materials 雑誌   3   2019.06

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    Kind of work:Joint Work  

  • Preparation of a novel bromine complex and its application in organic synthesis

    Hideki Fujiwara

    Tetrahedron   75 ( 10 )   1398 - 1405   2019.01( ISSN:0040-4020

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    Publishing type:Research paper (scientific journal)   International / domestic magazine:Domestic journal  

    Although molecular bromine (Br-2) is a useful brominating reagent, it is not easy to handle. Herein, we describe the preparation of a novel air-stable bromine complex prepared from 1,3-dimethy1-2-imidazolidinone (DMI) and Br-2, which was identified to be (DMI)(2)HBr3 by spectral and X-ray techniques. This complex was then used to brominate olefins, carbonyl compounds, and aromatics, as well as in the Hofmann rearrangement. Yields of reaction products using this complex were almost the same or superior to those using other bromine alternatives. (C) 2019 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.tet.2019.01.055

  • Preparation of a novel bromine complex and its application in organic synthesis Reviewed

    Y. Nishio, K. Yubata, Y. Wakai, K. Notsu, K. Yamamoto, H. Fujiwara, H. Matsubara

    Tetrahedron 雑誌 Elsevier   75   1398 - 1405   2019.01

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    Kind of work:Joint Work  

  • Extreme multi-point van der Waals interactions: isolable dimers of phthalocyanines substituted with pillar-like azaacenes

    Hidenori Saeki, Daisuke Sakamaki, Hideki Fujiwara, Shu Seki

    Chemical Science   10 ( 39 )   8939 - 8945   2019( ISSN:2041-6520

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/C9SC01739A

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  • Photokinetic study on remarkable excimer phosphorescence from heteroleptic cyclometalated platinum(II) complexes bearing a benzoylated 2-phenylpyridinate ligand Reviewed

    Okamura Naoki, Maeda Takeshi, Fujiwara Hideki, Soman Anjaly, Unni K, N. Narayanan, Ajayaghosh Ayyappanpillai, Yagi Shigeyuki

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   20 ( 1 )   542 - 552   2018.01( ISSN:1463-9076

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c7cp06944h

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  • Photokinetic study on remarkable excimer phosphorescence from heteroleptic cyclometalated platinum(II) complexes bearing a benzoylated 2-phenylpyridinate ligand Reviewed

    N. Okamura, T. Maeda, H. Fujiwara, A. Soman, K. N. Narayanan Unni, A. Ajayaghosh, S. Yagi

    Physical Chemistry Chemical Physics 雑誌 Royal Society of Chemistry   20   542 - 552   2017.11

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    Kind of work:Joint Work  

  • Malachite Green Derivatives for Dye-sensitized Solar Cells: Optoelectronic Characterizations and Persistence on TiO2 Reviewed

    J.-B. Harlé, S. Arata, S. Mine, T. Kamegawa, V. T. Nguyen, T. Maeda, H. Nakazumi, H. Fujiwara

    Bull. Chem. Soc. Jpn. 雑誌 The Chemical Society of Japan   91   52 - 64   2017.10

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  • Luminescence and Single-Molecule Magnet Behaviour in Lanthanide Coordination Complexes Involving Benzothiazole-Based Tetrathiafulvalene Ligands Reviewed

    Y. Kishi, L. Cornet, F. Pointillart, F. Riobé, B. Lefeuvre, O. Cador, B. Le Guennic, O. Maury, H. Fujiwara, L. Ouahab

    Eur. J. Inorg. Chem. 雑誌 Wiley VCH   2018   458 - 468   2017.09

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    Kind of work:Joint Work  

  • Deep Blue Asymmetrical Cyanine Dyes. Synthesis, Spectroscopic Characterization and Ion-Specific Cooperative Adsorption at the Surface of TiO2 Anatase Nanoparticles Reviewed

    J.-B. Harlé, S. Mine, T. Kamegawa, V. T. Nguyen, T. Maeda, H. Nakazumi, H. Fujiwara

    J. Phys. Chem. C 雑誌 American Chemical Society   2017.07

  • A novel symmetric TTF-pyridyl thiolato zinc complex: synthesis, characterization and crystal structure analysis.

    Okuno R, Yamaguchi M, Fujiwara H

    Dalton transactions (Cambridge, England : 2003)   46 ( 15 )   4912 - 4916   2017.04( ISSN:1477-9226

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  • A Novel symmetric TTF-pyridyl thiolato zinc complex: Synthesis, characterization and crystal structure analysis Reviewed

    R. Okuno, M. Yamaguchi, H. Fujiwara

    Dalton Trans. 雑誌 Royal Society of Chemistry   46   4912 - 4916   2017.04

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  • Isotopically Enriched Polymorphs of Dysprosium Single Molecule Magnets Reviewed

    Y. Kishi, F. Pointillart, B. Lefeuvre, F. Riobé, B. Le Guennic, S. Golhen, O. Cador, O. Maury, H. Fujiwara, L. Ouahab

    Chem. Commun. 雑誌 Royal Society of Chemistry   53   3575 - 3578   2017.03

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  • New Ethylenedithio-TTF Containing a 2,2,5,5-Tetramethylpyrrolin-1-yloxyl Radical through a Vinylene Spacer and Its FeCl4– Salt - Synthesis, Physical Properties and Crystal Structure Analyses Reviewed

    K. Horikiri, H. Fujiwara

    Magnetochemistry 雑誌 MDPI   3   2017.02

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  • Isotopically enriched polymorphs of dysprosium single molecule magnets

    Y. Kishi, F. Pointillart, B. Lefeuvre, F. Riobé, B. Le Guennic, S. Golhen, O. Cador, O. Maury, H. Fujiwara, L. Ouahab

    Chemical Communications   53 ( 25 )   3575 - 3578   2017

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/C7CC00317J

  • Anisotropic Field Dependence of the Superconducting Transition in the Magnetic Molecular Superconductor κ-(BETS)2FeBr4 Reviewed

    S. Fukuoka, S. Yamashita, Y. Nakazawa, T. Yamamoto, H. Fujiwara

    J. Phys. Soc. Jpn. 雑誌 日本物理学会   86   2016.12

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  • Interplay between conducting and magnetic systems in the antiferromagnetic organic superconductor κ-(BETS)2FeBr4 Reviewed

    M. V. Kartsovnik, M. Kunz, L. Schaidhammer, F. Kollmannsberger, W. Biberacher, N. D. Kushch, A. Miyazaki, H. Fujiwara

    Journal of Superconductivity and Novel Magnetism 雑誌 Springer   29   3075 - 3080   2016.10

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  • Thermodynamic properties of antiferromagnetic ordered states of π−d interacting systems of κ−(BETS)2FeX4(X=Br,Cl) Reviewed

    S. Fukuoka, S. Yamashita, Y. Nakazawa, T. Yamamoto, H. Fujiwara, T. Shirahata, and K. Takahashi

    Phys. Rev. B 雑誌 American Physical Society   93   2016.06

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  • Novel bis- and tris-cyclometalated iridium(III) complexes bearing a benzoyl group on each fluorinated 2-phenylpyridinate ligand aimed at development of blue phosphorescent materials for OLED Reviewed

    N. Okamura, T. Nakamura, S. Yagi, T. Maeda, H. Nakazumi, H. Fujiwara, S. Koseki

    RSC Advances 雑誌 Royal Society of Chemistry   6   51435 - 51445   2016.05

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  • Novel bis- and tris-cyclometalated iridium(III) complexes bearing a benzoyl group on each fluorinated 2-phenylpyridinate ligand aimed at development of blue phosphorescent materials for OLED Reviewed

    Naoki Okamura, Taiyo Nakamura, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, Shiro Koseki

    RSC ADVANCES   6 ( 56 )   51435 - 51445   2016( ISSN:2046-2069

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    Publishing type:Research paper (scientific journal)  

    Novel bis- and tris-cyclometalated iridium(III) complexes bearing a benzoyl group on each fluorinated 2-phenylpyridinate ligand were developed, aimed at the development of blue phosphorescent materials for organic light-emitting diodes (OLED). When acetylacetonate (acac) was employed as an ancillary ligand, the emission wavelength (lambda(PL)) of the 5'-benzoylated bis-cyclometalated complex was blue-shifted up to 479 nm (in dichloromethane at rt, emitting bluish green) in combination with fluorine substituents. Ancillary ligand replacement in the 2-(5-benzoyl-4,6-difluorophenyl)pyridinate-based bis-cyclometalated complex from acac to picolinate gave rise to a further blue shift of lPL to 464 nm, and sky-blue emission was observed. The 2-(5-benzoyl-4,6-difluorophenyl) pyridinate-based homoleptic tris-cyclometalated complex exhibited a more blue-shifted lPL at 463 nm than any other bis- and tris-cyclometalated complexes developed here, emitting sky blue with a photoluminescence quantum yield of 0.90 (in dichloromethane at rt). Using this sky-blue phosphorescent tris-cyclometalated complex as an emitting dopant, a poly(9-vinylcarbazole)-based OLED was fabricated, and excellent blue emission with a Commission Internationale de L'eclairage (CIE) chromaticity coordinate of (0.16, 0.28) was observed, where an external quantum efficiency (eta(ext)) of 1.81% was obtained. The OLED performance was drastically improved by using a solution-processed double-emitting layer device structure, and eta(ext)s of 8.55 and 7.46% were achieved for the present sky-blue phosphorescent bis-and tris-cyclometalated iridium(III) complexes, respectively (CIE chromaticity coordinates: (0.17, 0.33) and (0.17, 0.29), respectively).

    DOI: 10.1039/c6ra09385j

  • Synthesis, structure, and properties of coordination complexes based on zinc halides and TTF-pyridyl ligand Reviewed

    Y. Liang, X.-W. Xiao, L.-R. Meng, D.-B. Xiao, D. Zhao, L.-J. Shen, J.-H. Fang, H. Fujiwara

    Synthetic Metals 雑誌 Elsevier   203   2015.03

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  • Single crystal growth of new heavy fermion compounds CePt2In7 and Ce2PtIn8 Reviewed

    H. Shishido, T. Yoshihara, D. Nagamiya, S. Noguchi, H. Fujiwara, T. Ishida

    J. Phys.: Conf. Ser. 雑誌 IOP science   592   2015

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  • Novel 10,13-disubstituted dipyrido[3,2-a:2′,3′-c]phenazines and their platinum(II) complexes: highly luminescent ICT-type fluorophores based on D–A–D structures Reviewed

    T. Shigehiro, S. Yagi, T. Maeda, H. Nakazumi, H. Fujiwara, Y. Sakurai

    Tetrahedron Lett. 雑誌 Elsevier   55   5195 - 5198   2014.09

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  • Photofunctional Conductors Based on TTF-BODIPY Dyads Bearing p-Phenylene and p-Phenylenevinylene Spacers Reviewed

    K. Tsujimoto, R. Ogasawara, T. Nakagawa, H. Fujiwara

    Eur. J. Inorg. Chem. 雑誌 Wiley-VCH   3960 - 3972   2014.08

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  • Self-ordering of organic-metal hybrid microstructures based on tetrathiafulvalene derivatives Reviewed

    X.-W. Xiao, W. Pan, Z.-Q. Wang, L.-J. Shen, J.-H. Fang, H.-Q. Gao, X. Li, H. Fujiwara

    Synth. Metals 雑誌 Elsevier   189   42 - 46   2014.03

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  • TTF-fluorene dyads and their M(CN)2– (M = Ag, Au) salts designed for photoresponsive conducting materials Reviewed

    K. Tsujimoto, R. Ogasawara, Y. Kishi, H. Fujiwara

    New. J. Chem. 雑誌 Royal Society of Chemistry   38   2014.01

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  • TTF-fluorene dyads and their M(CN)(2)(-) (M = Ag, Au) salts designed for photoresponsive conducting materials Reviewed

    Keijiro Tsujimoto, Reiko Ogasawara, Yosuke Kishi, Hideki Fujiwara

    NEW JOURNAL OF CHEMISTRY   38 ( 1 )   406 - 418   2014.01( ISSN:1144-0546

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    To explore photoresponsive conducting materials, we developed new tetrathiafulvalene (TTF)-fluorene D-A dyads with a sigma-bonded thiomethylene spacer (1a-d) or a pi-conjugated ethylene spacer (2a-b) and reported their synthesis, electrochemical and optical properties. Fluorescence studies suggested that the fluorescence from an excited fluorene part is quenched by an intramolecular electron transfer process from the electron-donating TTF part to the fluorene part, and the intramolecular interaction through the pi-conjugated ethylene spacer is stronger and shows more suppression than the non-planar sigma-bonded thiomethylene spacer. We also investigated photoelectric conversion functionality by a photoelectrochemical method using the thin films of dyads 1-2 spin-coated on ITO-coated glass substrates. We observed electric current generation that depends on the absorption spectra of thin films, suggesting that absorbed photons are converted to electric currents on the thin film/ITO electrode. Crystal structure analysis and measurement of photoconductivity of a single crystalline sample of molecule 1d having 4,5-bis(methylthio)-substituents suggest generation of photocurrents along the stacking direction of the TTF parts by the photoinduced intramolecular electron transfer and the resultant charge-separated state. Furthermore, we also reported the crystal structure analyses, photoconductivity and magnetic properties of the cation radical salts, 2b(2)M(CN)(2) (M = Ag, Au), where 2b contains a 4,5-ethylenedithio-substituent. The Ag(CN)(2) salt showed a semiconducting behaviour with a room temperature conductivity of 0.088 S cm(-1) due to a half-filled Mott insulating band structure of this crystal that originates from a strongly dimerized intermolecular interaction. Upon photoirradiation, this salt showed a slight enhancement of conductivities of ca. 14%.

    DOI: 10.1039/c3nj00979c

  • Photo- and electroluminescence from deep-red- and near-infrared-phosphorescent tris-cyclometalated iridium(III) complexes bearing largely π-extended ligands Reviewed

    S. Ikawa, S. Yagi, T. Maeda, H. Nakazumi, H. Fujiwara, S. Koseki, Y. Sakurai

    Inorg. Chem. Commun. 雑誌 Elsevier   38   14 - 19   2013.10

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  • CuII and CuI coordination complexes involving two tetrathiafulvalene-1,3-benzothiazole hybrid ligands and their radical cation salts Reviewed

    Sayo Yokota, Keijiro Tsujimoto, Sadayoshi Hayashi, Fabrice Pointillart, Lahcène Ouahab, Hideki Fujiwara

    Inorganic Chemistry   52 ( 11 )   6543 - 6550   2013.06( ISSN:0020-1669

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    Preparations, crystal structure analyses, and magnetic property investigations on a new CuII(hfac)2 complex coordinated with two TTF -CH=CH -BTA ligands, where hfac is hexafluoroacetylacetonate, TTF is tetrathiafulvalene, and BTA is 1,3-benzothiazole, are reported together with those of its dicationic AsF6- salt, [Cu(hfac) 2(TTF -CH=CH -BTA)2](AsF6)2, in which each TTF part is in a radical cation state. In these Cu II(hfac)2 complexes, two ligands are bonded to the central Cu atom of the Cu(hfac)2 part through the nitrogen atom of the 1,3-benzothiazole ring and occupy the two apical positions of the Cu(hfac) 2 complex with an elongated octahedral geometry. These two ligands are located parallelly in a transverse head-to-tail manner, and the Cu(hfac)2 moiety is closely sandwiched by these two ligands. In the AsF6- salt of the Cu(hfac)2 complex, each TTF dimer is separated by the AsF6- anions and has no overlap with each other within the one-dimensional arrays, resulting in an insulating behavior. Both Cu(hfac)2 complexes showed the simple Curie-like temperature dependence of paramagnetic susceptibilities (χM), indicating that no interaction exists between the paramagnetic CuII d spins. Furthermore, crystal structure analysis and magnetic/conducting properties of a radical cation ReO4- salt of the Cu I complex with two TTF -CH=CH -BTA ligands, [Cu(TTF -CH=CH -BTA) 2](ReO4)2, are also described. Two nitrogen atoms of the ligands are connected to the central CuI in a linear dicoordination with a Cu-N bond length of 1.879(9) Å. Two TTF parts of the neighboring complexes form a dimerized structure, and such a TTF dimer forms a one-dimensional uniform array along the a direction with a short S-S contact of 3.88 Å. Magnetic property measurement suggested the existence of a strongly antiferromagnetic one-dimensional uniform chain of S = 1/2 spins that originate from the radical cation states of the TTF dimers. Due to the construction of the one-dimensional uniform array of the radical cation state of the TTF dimer along the a axis, a semiconducting behavior is observed with σrt = of 6 × 10-5 S cm-1 and an activation energy of Ea = 0.16 eV. © 2013 American Chemical Society.

    DOI: 10.1021/ic4005246

    PubMed

  • CuII and CuI Coordination Complexes Involving Two Tetrathiafulvalene-1,3-benzothiazole Hybrid Ligands and their Radical Cation Salts Reviewed

    S. Yokota, K. Tsujimoto, S. Hayashi, F. Pointillart, L. Ouahab, H. Fujiwara

    Inorg. Chem. 雑誌 American Chemical Society   52   6543 - 6550   2013.05

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  • Photo-and electroluminescence from 2-(dibenzo[b, d]furan-4-yl)pyridine- based heteroleptic cyclometalated platinum(II) complexes: Excimer formation drastically facilitated by an aromatic diketonate ancillary ligand Reviewed

    Tatsuya Shigehiro, Shigeyuki Yagi, Takeshi Maeda, Hiroyuki Nakazumi, Hideki Fujiwara, Yoshiaki Sakurai

    Journal of Physical Chemistry C   117 ( 1 )   532 - 542   2013.01( ISSN:1932-7447

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    To clarify the ancillary ligand effect on excimer formation of heteroleptic cyclometalated platinum(II) complexes, we investigated photo-and electroluminescence behavior for green-phosphorescent [(dibenzo[b,d]furan-4-yl) pyridinato-N,C3′]platinum(II) 1,3-diketonates Pt-1 and Pt-2 (1,3-diketonate ancillary ligands
    1,3-bis(3,4-dibutoxyphenyl)propane-1,3- dionate (bdbp) and dipivaloylmethanate (dpm) for Pt-1 and Pt-2, respectively). The X-ray crystallographic study reveals that both Pt-1 and Pt-2 form dimeric pairs in the solid states, indicating that they are likely to form the excimers. In PMMA films doped with Pt-1, red-shifted photoluminescence at &gt
    600 nm, assignable to the excimer emission, increasingly emerges along with the original monomer emission at 516 and 552 nm as the doping level of Pt-1 is increased to 44 wt %. Pt-2-doped films give quite modest excimer-based photoluminescence even when heavily doped to the same extent as Pt-1-doped films. This clearly indicates that the aromatic ancillary ligand (bdbp) effectively facilitates the excimer formation rather than the aliphatic (dpm). Similar efficient excimer formation is also observed for electroluminescent devices such as poly(9-vinylcarbazole)-based polymer light-emitting diodes (PLEDs) doped with Pt-1. The Pt-1-doped PLEDs afford electroluminescence from green to orange when the doping level of Pt-1 is varied from 7.1 to 24 wt %. Thus, referring to the Commission Internationale de L'Eclairage (CIE) chromaticity coordinate, the color tuning is available from CIE = (0.40, 0.57) to (0.56, 0.43) (@maximum luminance). We also found that the excimer-based luminescence of Pt-1 is enhanced in the PLEDs more than in polymer thin films upon photoexcitation. This result shows the difference in the mechanism of triplet excimer formation between photo-and electroluminescence and indicates that the efficient triplet excimer formation is caused by direct charge recombination of anion and cation radicals of Pt-1. © 2012 American Chemical Society.

    DOI: 10.1021/jp307853t

  • Conformational effect of symmetrical squaraine dyes on the performance of dye-sensitized solar cells Reviewed

    T. Maeda, S. Mineta, H. Fujiwara, H. Nakao, S. Yagi H. Nakazumi

    J. Mater. Chem. A 雑誌 Royal Society of Chemistry   1   1303 - 1309   2013.01

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  • Photocurrent generation based on new tetrathiafulvalene-BODIPY dyads Reviewed

    K. Tsujimoto, R. Ogasawara, H. Fujiwara

    Tetrahedron Lett. 雑誌 Elsevier   54   1251 - 1255   2013.01

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  • Conformational effect of symmetrical squaraine dyes on the performance of dye-sensitized solar cells Reviewed

    Takeshi Maeda, Shohei Mineta, Hideki Fujiwara, Hidekazu Nakao, Shigeyuki Yagi, Hiroyuki Nakazumi

    JOURNAL OF MATERIALS CHEMISTRY A   1 ( 4 )   1303 - 1309   2013( ISSN:2050-7488

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    A symmetrical squaraine dye altered to possess dicyanovinylene functionality on a carbonyl group of the cyclobutene core (SQM1a) was synthesized to elucidate the effects of the conformationally locked-in cis-like form ensured by the steric repulsion of dicyanovinylenes on the performance of dye-sensitized solar cells (DSSCs) through a comparison with an unsymmetrical analogue bearing one carboxy group (SQM1b) and a standard squaraine dye (MSQ). The FT-IR spectrum of the TiO2 thin film immersed in the dye solution suggested that the linkages between the dye and TiO2 were formed by both carboxy groups symmetrically incorporated on the pi-conjugation of dyes. The symmetrical and conformationally locked structure of SQM1a brought about a decrease in the non-radiative decay rate, which may have been induced by suppression of the possible photoisomerization of squaraines. In accordance with the finding of non-radiative decay, a DSSC fabricated with SQM1a exhibited a significantly enhanced shortcircuit current density, which revealed an efficient electron injection derived from the double-anchored and conformationally locked structure of SQM1a. Consequently, the performance of DSSCs fabricated with SQM1a was higher than the performance of those fabricated with SQM1b and MSQ. This indicates that substantial advantages can be derived by restricting the conformation of symmetrical squaraine dyes.

    DOI: 10.1039/c2ta00883a

  • Photo- and Electroluminescence from 2‑(Dibenzo[b,d]furan-4-yl)pyridine-Based Heteroleptic Cyclometalated Platinum(II) Complexes: Excimer Formation Drastically Facilitated by an Aromatic Diketonate Ancillary Ligand Reviewed

    T. Shigehiro, S. Yagi, T. Maeda, H. Nakazumi, H. Fujiwara, Y. Sakurai

    J. Phys. Chem. C 雑誌 American Chemical Society   117   2012.11

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  • Photoluminescence color tuning of phosphorescent bis-cyclometalated iridium(III) complexes by ancillary ligand replacement Reviewed

    S. Ikawa, S. Yagi, T. Maeda, H. Nakazumi, H. Fujiwara, Y. Sakurai

    Dyes and Pigm. 雑誌 Elsevier   95   695 - 705   2012.07

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  • Structures and electrical properties of a new molecular conductor, (BSM-TTP)4(PF6)3(C6H5Cl)2 Reviewed

    H. Tsuji, M. Yasuda, T. Shirahata, H. Fujiwara, T. Sugimoto, Y. Misaki

    Phys. Status Solidi C 雑誌 Elsevier   9   1149 - 1151   2012.04

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  • Photoinduced Triplet States of Photoconductive TTF Derivatives Including a Fluorescent Group Reviewed

    K. Furukawa, Y. Sugishima, H. Fujiwara, and T. Nakamura

    Chem. Lett. 雑誌 Chemical Society of Japan   40   292 - 294   2011.03

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  • Photoinduced Triplet States of Photoconductive TTF Derivatives Including a Fluorescent Group Reviewed

    Ko Furukawa, Yasuo Sugishima, Hideki Fujiwara, Toshikazu Nakamura

    CHEMISTRY LETTERS   40 ( 3 )   292 - 294   2011.03( ISSN:0366-7022

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    The spin dynamics of photoconductive tetrathiafulvalene (TTF) derivatives containing 2,5-diphenyl-1,3,4-oxadiazole (PPD) was examined using time-resolved electron spin resonance (TR-ESR) spectroscopy. TR-ESR signals of a frozen solution sample under visible excitation were attributed to the excited triplet state T-1, which was populated via intersystem crossing from the excited singlet state S-1 as confirmed by TR-ESR spectral simulations. From DFT calculations, the spin-density distribution of the T-1 state was found to be concentrated around the linker between the TTF and PPD molecules.

    DOI: 10.1246/cl.2011.292

  • Structures and Electrical Properties of (BTM-TS-TTP)4PF6 Reviewed

    M. Yasuda, E. Fujiwara, S. Aonuma, H. Fujiwara, T. Sugimoto, T. Nakayashiki, K. Tanaka, K. Takahashi, H. Kobayashi, Y. Misaki

    Bull. Chem. Soc. Jpn. 雑誌 Chemical Society of Japan   84   79 - 81   2011.01

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  • Crystal structure and physical properties of a magnetic molecular conductor (EDO-TTFVODS)2FeCl4 Reviewed

    X.-W. Xiao, J.-H. Fang, J. Zhou, H.-Q. Gao, H. Fujiwara, T. Sugimoto

    Synth. Metals 雑誌 Elsevier   160   2413 - 2416   2010.12

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  • Development of Photofunctional Materials Using TTF derivatives Containing a 1,3-Benzothiazole Ring Reviewed

    H. Fujiwara, S. Yokota, S. Hayashi, S. Takemoto, H. Matsuzaka

    Physica B 雑誌 Elsevier Science Ltd.   405   S15 - S18   2010.06

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  • New Fluorene-substituted TTF Derivatives as Photofunctional Materials Reviewed

    H. Fujiwara, K. Tsujimoto, Y. Sugishima, S. Takemoto, H. Matsuzaka

    Physica B 雑誌 Elsevier Science Ltd.   405   S12 - S14   2010.06

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  • Low-temperature far-infrared absorption in the antiferromagnetic organic superconductor κ-(BETS)2FeBr4 Reviewed

    N. Hossein Khah, G. V. Sudhakar Rao, M. Reedyk, H. Fujiwara, H. Kobayashi, T. Nakamura, K. Yakushi, M. A. Tanatar

    Phys. Rev. B 雑誌 American Physical Society   81   092508/1 - 4   2010.03

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  • A Bimetallic Ru2Pt Complex Containing a Trigonal-Planar mu3-Cabido Ligand: Formation, Structure, and Reactivity Relevant to the Fischer-Tropsch Process Reviewed

    S. Takemoto, H. Morita, K. Karitani, H. Fujiwara, H. Matsuaka

    J. Am. Chem. Soc. 雑誌 American Chemical Society   131   18026 - 18027   2009.12

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  • A Bimetallic Ru2Pt Complex Containing a Trigonal-Planar mu(3)-Carbido Ligand: Formation, Structure, and Reactivity Relevant to the Fischer-Tropsch Process Reviewed

    Shin Takemoto, Hidenobu Morita, Kenji Karitani, Hideki Fujiwara, Hiroyuki Matsuzaka

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   131 ( 50 )   18026 - +   2009.12( ISSN:0002-7863

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    The bimetallic Ru2Pt complex [((CpRu)-Ru-star)(2)(mu(2)-NHPh)(mu(2)-H)(mu(3)-C)PtMe(PMe3)(2)][OTf] (3; Cp-star = eta(5)-C5Me5) containing a planar three-coordinate carbido ligand has been prepared in 93% yield by thermal isomerization of the bridging methylene precursor [((CpRu)-Ru-star)(2)Me(mu(3)-NPh)(mu(2)-CH2)Pt(PMe3)(2)][OTf] (2) via cleavage of the methylene C-H bonds. Exposure of the carbido complex 3 to carbon monoxide (1 atm) induced coupling of the carbido ligand with the nearby methyl and hydride ligands to produce the diruthenium ethylidene complex [((CpRu)-Ru-star)(2)(mu(2)-CHMe)(mu(2)-NHPh)(CO)(2)][OTf] (4) and the known triplatinum complex [Pt(CO)(PMe3)](3). The crystal structures of 2, 3, and 4 (BPh4 salt) are reported.

    DOI: 10.1021/ja907387w

    PubMed

  • Single-Molecule Junctions with Strong Molecule-lectrode Coupling Reviewed

    M. Taniguchi, M. Tsutsui, K. Shoji, H. Fujiwara, T. Kawai

    J. Am. Chem. Soc. 雑誌 American Chemical Society   131   14146 - 14147   2009.10

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  • Single-Molecule Junctions with Strong Molecule-Electrode Coupling Reviewed

    Masateru Taniguchi, Makusu Tsutsui, Kohei Shoji, Hideki Fujiwara, Tomoji Kawai

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   131 ( 40 )   14146 - +   2009.10( ISSN:0002-7863

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    We fabricated Au-TTF-Au (tetrathiafulvalene, TTF) and Au-TSF-Au (tetraselenafulvalene, TSF) single-molecule junctions using a nanofabricated mechanically controllable break junction. We found that Au-TSF-Au and Au-TTF-Au single-molecule junctions have one and two stable configurations, respectively, and that the Au-TTF-Au single-molecule conductance is Larger than that of Au-TSF-Au. The difference in single-molecule conductances of the two types of junctions originates from the difference in the strength of the molecule-electrode coupling through face-to-face overlapping configurations.

    DOI: 10.1021/ja905248e

    PubMed

  • Interconvertable Bistability in Magnetic Organic Conductors Based on Bent Donor Molecules, EDO-EDSe-TTFVS(O) Reviewed

    X.-F. Shao, Y. Yamaji, H. Fujiwara, T. Sugimoto

    J. Mater. Chem. 雑誌 Royal Society of Chemistry   19   5837 - 5844   2009.08

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  • New aspects of π-d interactions in magnetic molecular conductors Reviewed

    T. Sugimoto, H. Fujiwara, S. Noguchi, K. Murata

    Science and Technology of Advanced Materials 雑誌 National Institute for Materials Science   10   2009.04

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  • Interconvertible bistability in magnetic organic conductors based on bent donor molecules, EDO-EDSe-TTFVS(O) Reviewed

    Xiangfeng Shao, Yuhta Yamaji, Hideki Fujiwara, Toyonari Sugimoto

    JOURNAL OF MATERIALS CHEMISTRY   19 ( 32 )   5837 - 5844   2009( ISSN:0959-9428

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    Electrochemical oxidation of a bent donor molecule ethylenedioxy-ethylenediseleno-tetrathiafulvaleno-thioquinone-1,3-dithiolemethide (EDO-EDSe-TTFVS, 1) and the corresponding quinone derivative EDO-EDSe-TTFVO (2) in the presence of (Bu(4)N)MCl(4) (M Ga, Fe) affords single crystals of three radical cation salts, 1(2)FeCl(4), 1(2)GaCl(4), and 2(2)FeCl(4)(DCE) (DCE 1,2-dichloroethane). All of these salts exhibit semiconductor-to-semiconductor first-order phase transitions with a relatively large thermal hysteresis width (&gt;15 K). The d-spins of FeCl(4)(-) ions in both 1(2)FeCl(4) and 2(2)FeCl(4)(DCE) show relatively strong antiferromagnetic interactions with Weiss temperatures of -7.1 and -9.2 K, respectively. The antiferromagnetic interaction in both salts originates from the preferential d-pi-pi-d interaction. The crystal structures of both 1(2)FeCl(4) and 1(2)GaCl(4) are solved at 298 and 150 K, which correspond to the high- and low-temperature phases (H- and L-phases), respectively. In each phase, the crystal structures of 1(2)FeCl(4) and 1(2)GaCl(4) are isomorphous. The donor molecules in the H- and L-phases of 1(2)FeCl(4) have similar packing patterns composed of one-dimensional columns with donor dimers. The phase transition of 1(2)FeCl(4) is accompanied by a slight orientational change of donor molecules in a dimer, and the electron correlation is enhanced on cooling. On the basis of the "molecular coordinates&apos;&apos;, the effect of the molecular rotation on the electronic phase transition is discussed. The results indicate that a slight molecular rotation can give rise to a significant change of electron correlation even in an electronic system with strong intermolecular interactions.

    DOI: 10.1039/b904061g

  • Synthesis, structure and photoelectrochemical properties of new tetrathiafulvalene-diphenyl-1,3,4-oxadiazole dyads Reviewed

    H. Fujiwara, Y. Sugishima, K. Tsujimoto

    Tetrahedron Lett. 雑誌 Elsevier Science Ltd.   49   7200 - 7203   2008.12

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  • Negative magnetoresistance in an antiferromagnetic metal β''-(EDO-TTFVODS)2 FeBr4(DCE)0.5 Reviewed

    Y.-F. Weng, H. Yoshino, H. Fujiwara, T. Sugimoto, K. Murata

    Solid State Sciences 雑誌 Elsevier Science Ltd.   10   1745 - 1748   2008.12

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  • Synthesis, Synthesis, structure and physical properties of a new TTF derivative containing a PPD part Reviewed

    H. Fujiwara, Y. Sugishima, K. Tsujimoto

    J. Phys.: Conf. Ser. 雑誌 IOP Publishing   132   012025 - 5   2008.10

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  • ESR study on molecular salt (Benzo-TTFVS)<inf>2</inf>MBr<inf>4</inf> (M = Fe, Ga)

    Shuichi Kawamata, Takekazu Ishida, Taro Hayakawa, Takashi Hiraoka, Hideki Fujiwara, Toyonari Sugimoto

    Journal of the Korean Physical Society   53 ( 9(2) )   1014 - 1019   2008.08( ISSN:0374-4884

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    Electron spin resonance (ESR) experiments on (Benzo-TTFVS) 2MBr4 (M = Fe, Ga) have been done with 15.4 GHz microwaves, where Benzo-TTFVS denotes a new donor molecule substituted with a benzo group, benzotetrathiafulvalenothioquinone-l,3-dithiolemethide. The temperature and the magnetic-field-direction dependencies of the effective g-value and the linewidth are obtained. In (Benzo-TTFVS)2GaBr 4 (Ga salt), the ESR signals are due to π-electrons while they originate from d-electrons at the Fe3+ ion in the case of (Benzo-TTFVS)2FeBr4 (Fe salt). The g-value and the linewidth for the direction of the π-d correlation are different from those for other directions in the Fe salt. A strong antiferromagnetic fluctuation related to the π-d correlation is observed in the Fe salt. On the other hand, in the Ga salt, the magnetic-field-direction dependencies of the g-value and the linewidth reflect the anisotropy of the one-dimensional conduction band. The importance of the π-d correlation is proved by comparing the ESR results for the Fe salt with those for the Ga salt.

    DOI: 10.3938/jkps.53.1014

  • Fe2OCl62? Salt Formed by Electrochemical Oxidation of Ethylenedioxytetrathiafulvalenoquinone-1,3-dithiolemethide in the Presence of FeCl4? Ion with a Silicon Wafer Electrode Reviewed

    T. Koike, S. Yokota, H. Fujiwara, T. Sugimoto, S. Noguchi, D. de Caro, L. Valade

    Inorg. Chem. 雑誌 American Chemical Society   47   7074 - 7076   2008.08

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  • Fe2OCl62- salt formed by electrochemical oxidation of ethylenedioxytetrathiafulvalenoquinone-1,3-dithiolemethide in the presence of FeCl4- ion with a silicon wafer electrode Reviewed

    Tadahiro Koike, Sayo Yokota, Hideki Fujiwara, Toyonari Sugimoto, Satoru Noguchi, Dominique de Caro, Lydie Valade

    INORGANIC CHEMISTRY   47 ( 16 )   7074 - 7076   2008.08( ISSN:0020-1669

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    Electrochemical oxidation of a bent donor molecule, ethylenedioxytetrathiafulvalenoquinone-1,3-dithiolmethide (2), in chlorobenzene (PhCl)/ethanol containing NBu4FeCl4 as a supporting electrolyte is performed using an undoped silicon wafer electrode. Black crystals of 2(6) center dot Fe2OCl6 center dot 2PhCl are obtained that have a different molecular formula from that of 2(2) center dot FeCl4 crystals obtained previously using a platinum rod electrode. The new crystal has a structure composed of alternately stacked layers of 2 molecules and Fe2OCl62- ions, whose Fe-O-Fe bond is completely linear and for which the geometry around the Fe atom is almost tetrahedral. The electrical resistivity decreases with temperature until ca. 200 K, but below this temperature, it gently increases. The magnetic susceptibility (chi(p)) observed can be described by the sum of chi(p) obeying a Curie-Weiss law for the impurity spins and of chi(p) obeying a dimer model with a spin-exchange integral (J similar to -180 K) in each Fe2OCl62- ion, which is also weakly coupled to neighboring Fe2OCl62- ions through an additional exchange interaction.

    DOI: 10.1021/ic8006487

    PubMed

  • Novel Sulfur-Selenium Exchange in Ethylenedioxy- and Ethylenedithiodithiadiselenafulvalenedithiolates Reviewed

    T. Hayashi, X.-W. Xiao, Y. Yamaji, H. Fujiwara, T. Sugimoto, H. Nakazumi

    Chem. Lett. 雑誌 Chemical Society of Japan   37   428 - 429   2008.04

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  • Structures and electrical properties of beta- and theta-(BTM-TTP)(2)SbF6 Reviewed

    Manami Noda, Misaki Yasuda, Yoshiaki Nakano, Akihiro Ito, Hiroyuki Fueno, Kazuyoshi Tanaka, Hideki Fujiwara, Toyonari Sugimoto, Yohji Misaki

    CHEMISTRY LETTERS   37 ( 4 )   396 - 397   2008.04( ISSN:0366-7022

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    Two kinds of (BTM-TTP)(2)SbF6 salts, where BTM-TTP is 2-[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-5-(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, have been prepared. X-ray structure analyses have revealed that needle-like and plate-like crystals have the so-called beta- and theta-type arrays of the donors, respectively. The beta-type salt exhibits metallic conducting behavior down to 5 K, while the theta-type salt is a semiconductor even at room temperature.

    DOI: 10.1246/cl.2008.396

  • Novel sulfur-selenium exchange in ethylenedioxydithiadiselenafulvalenedithiolates and ethylenedithiodithiadiselenafulvalenedithiolates Reviewed

    Toshiki Hayashi, Xunwen Xiao, Yuhta Yamaji, Hideki Fujiwara, Toyonari Sugimoto, Hiroyuki Nakazumi

    CHEMISTRY LETTERS   37 ( 4 )   428 - 429   2008.04( ISSN:0366-7022

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    Ethylenedioxy- and ethylenedithiodithiadiselenafulvalenedithiolates are subjected to sulfur-selenium exchange, in which one selenium atom in the molecular skeleton is replaced by an outside sulfur atom. The reaction of the exchanged dithiolates with 2-methylthio-1,3-dithiolylium ion gives the corresponding thioquinone-1,3-dithiolemethides as new donor molecules.

    DOI: 10.1246/cl.2008.428

  • Structures and Electrical Properties of beta- and theta-(BTM-TTP)2SbF6 Reviewed

    M. Noda, M. Yasuda, Y. Nakano, A. Ito, H. Fueno, K. Tanaka, H. Fujiwara, T. Sugimoto, Y. Misaki

    Chem. Lett. 雑誌 Chemical Society of Japan   37   396 - 397   2008.03

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    Kind of work:Joint Work  

  • Conducting Dimerized Cobalt Complexes with Tetrathiafulvalene (TTF) Dithiolate Ligands Reviewed

    E. Fujiwara, K. Hosoya, A. Kobayashi, H. Tanaka, M. Tokumoto, Y. Okano, H. Fujiwara, H. Kobayashi, Y. Fujishiro, E. Nishibori, M. Takata, M. Sakata

    Inorg. Chem. 雑誌 American Chemical Society   47   863 - 874   2008.02

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  • Conducting dimerized cobalt complexes, with tetrathlafulvalene dithiolate ligands Reviewed

    Emiko Fujiwara, Kazumasa Hosoya, Akiko Kobayashi, Hisashi Tanaka, Madoka Tokumoto, Yoshinori Okano, Hideki Fujiwara, Hayao Kobayashi, Yuichi Fujishiro, Eiji Nishibori, Masaki Takata, Makoto Sakata

    INORGANIC CHEMISTRY   47 ( 3 )   863 - 874   2008.02( ISSN:0020-1669

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    To obtain novel single-component molecular metals, we attempted to synthesize several cobalt complexes coordinated by TTF (tetrathiafulvalene)-type dithiolate ligands. We succeeded in the syntheses and structure determinations of ((Bu4N)-Bu-n)(2)[Co(chdt)(2)](2) (1), ((Bu4N)-Bu-n)(2) Co(dmdt)(2)](2) (2), (Co(dmdt)212 (3), and [Co(dt)(2)](2) (4) (chdt = cyclohexeno-TTF-dithiolate, dmdt = dimethyl-TTF-dithiolate, and dt = TTF-dithiolate). Structure analyses of complexes 1-4 revealed that two monomeric [Co &lt; ligand &gt;(2)](-) or [Co(ligand)(2)](0) units are connected by two Co-S bonds resulting in dimeric [Co &lt; ligand &gt;(2)](2)(2-) or [Co &lt; ligand &gt;(2)](2) molecules. Complex 1 has a cation-anion-intermingled structure and exhibited Curie-Weiss magnetic behavior with a large Curie constant (C = 2.02 K-center dot mu center dot mol(-1)) and weak antiferromagnetic interactions (theta = -8.3 K). Complex 2 also has a cation-anion-intermingled structure. However, the dimeric molecules are completely isolated by cations. Complexes 3 and 4 are single-component molecular crystals. The molecules of complex 3 form two-dimensional molecular stacking layers and exhibit a room-temperature conductivity of sigma(rt) = 1.2 x 10(-2) S center dot cm(-1) and an activation energy of E-a = 85 meV. The magnetic behavior is almost consistent with Curie-Weiss law, where the Curie constant and Weiss temperature are 8.7 x 10(-2) K center dot emu center dot mol(-1) and -0.85 K, respectively. Complex 4 has a rare chair form of the dimeric structure. The electrical conductivity was fairly large (sigma(rt) = 19 S center dot cm(-1)), and its temperature dependence was very small ((sigma K-0.55/sigma(rt) = ca. 1:10), although the measurements were performed on the compressed pellet sample. Complex 4 showed an almost constant paramagnetic susceptibility (chi(300) (K) = 3.5 x 10(-4) emu center dot mol(-1)) from 300 to 50 K. The band structure calculation of complex 4 suggested the metallic nature of the system. Complex 4 is a novel single-component molecular conductor with a dimeric molecular structure and essentially metallic properties down to very low temperatures.

    DOI: 10.1021/ic701100r

    PubMed

  • Evidence for strong pi-d Interaction in beta-(EDT-DSDTFVSDS)2FeBr4 Reviewed

    T. Fujimoto, S. Yasuzuka, K. Yokogawa, H. Yoshino, T. Hayashi, H. Fujiwara, T. Sugimoto, K. Murata

    J. Phys. Soc. Jpn. 雑誌 日本物理学会   77   2008.01

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  • New pi-Electron Donors with a 2,2,5,5-Tetramethylpyrrolin-1-yloxyl Radical Designed for Magnetic Molecular Conductors Reviewed

    E. Fujiwara, S. Aonuma, H. Fujiwara, T. Sugimoto, Y. Misaki

    Chem. Lett. 雑誌 Chemical Society of Japan   37   84 - 85   2008.01

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  • New pi-electron donors with a 2,2,5,5-tetramethylpyrrolin-1-yloxyl radical designed for magnetic molecular conductors Reviewed

    Emiko Fujiwara, Shuji Aonuma, Hideki Fujiwara, Toyonari Sugimoto, Yohji Misaki

    CHEMISTRY LETTERS   37 ( 1 )   84 - 85   2008.01( ISSN:0366-7022

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    For the development of magnetic molecular conductors, we succeeded in the synthesis of new pi-electron donors containing TTF (tetrathiafulvalene) or TTP (tetrathiapentalene) framework and a stable 2,2,5,5-tetramethylpyrrolin-1-yloxyl radical within a molecule and clarified the crystal structure and physical properties of these donors. We also discuss the conducting and magnetic properties of a TCNQF(4) complex of the synthesized TTF type donor.

    DOI: 10.1246/cl.2008.84

  • Weak Ferromagnetism in a Semiconducting (ethylenedithiodiselenadithiafulvalenoquinone-1,3-diselenolemethide)2FeBr4 Salt Reviewed

    T. Hayashi, X.-W. Xiao, H. Fujiwara, T. Sugimoto, H. Nakazumi, S. Noguchi, H. Aruga-Katori

    Inorg. Chem. 雑誌 American Chemical Society   46   8478 - 8480   2007.10

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  • An Antiferromagnetic Molecular Metal Based on a New Bent-Donor Molecule Reviewed

    X.-W. Xiao, T. Hayashi, H. Fujiwara, T. Sugimoto, S. Noguchi, Y. Weng, H. Yoshino, K. Murata, H. Aruga-Katori

    J. Am. Chem. Soc. 雑誌 American Chemical Society   129   12618 - 12619   2007.10

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  • Weak ferromagnetism in a semiconducting (ethylenedithiodiselenadithiafulvalenoquinone-1,3-diselenolemethide)(2)center dot FeBr4 salt Reviewed

    Toshiki Hayashi, Xunwen Xiao, Hideki Fujiwara, Toyonari Sugimoto, Hiroyuki Nakazumi, Satoru Noguchi, Hiroko Aruga Katori

    INORGANIC CHEMISTRY   46 ( 21 )   8478 - 8480   2007.10( ISSN:0020-1669

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    The 2:1 salts of a new bent donor molecule, ethylenedithiodiselenad ithiafulvalenocluinone- 1, 3-diselenolemethide (EDT-DSDT-FVODS) and either an FeBr4-, or a GaBr4- ion exhibit semiconducting properties and had small activation energies. The Fe-III d spins of the FeBr4- salt are initially subject to a strong antiferromagnetic interaction and afterward exhibited a weak ferromagnetism at 3.8 K With a very small remanent magnetization of ca. 4 x 10(-2) mu(B) and a spin-flop near 25 kOe along the intercolumnar direction.

    DOI: 10.1021/ic701260p

    PubMed

  • An antiferromagnetic molecular metal based on a new bent-donor molecule Reviewed

    Xunwen Xiao, Toshiki Hayashi, Hideki Fujiwara, Toyonari Sugimcrto, Satoru Noguchi, Yufeng Weng, Harukazu Yoshino, Keizo Murata, Hiroko Aruga Katori

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   129 ( 42 )   12618 - +   2007.10( ISSN:0002-7863

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    The crystal of a (ethylenedioxytetrathiafulvalenoquinone-1,3-diselenolemethide, 1)2 center dot FeBr(4)center dot(1,2-dichloroethane, DCE)(1/2) salt obtained by electrochemical oxidation of 1 in DCE containing a supporting electrolyte, NBU(4)center dot FeBr(4), exhibits metallic conductivity down to 0.45 K. The negative magnetoresistance of the electrical resistance (11) in the conducting ab -plane suggests stronger interactions between the d spins of the FeBr(4)(-) ions and the conducting Pi electrons than those in the FeCl(4)(-) salt of the corresponding 1,3-dithiolemethide donor molecule. The d spins order antiferromagnetically at 4.5 K, the highest temperature obtained so far in antiferromagnetic molecular metals with significant Pi-d interactions.

    DOI: 10.1021/ja074840q

    PubMed

  • New TTF and bis-TTF containing thiophene units: Electrical properties of the resulting salts Reviewed

    T. Abbaz, A.-K. Gouasmia, H. Fujiwara, T. Hiraoka, T. Sugimoto, M. Taillefer, J.-M. Fabre

    Synth. Met. 雑誌 Elsevier Science Ltd.   157   508 - 516   2007.07

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  • Nanowires of molecule-based charge-transfer salts Reviewed

    J.-P. Savy, D. de Caro, C. Faulmann, L. Valade, M. Almeida, T. Koike, H. Fujiwara, T. Sugimoto, J. Fraxedas, T. Ondar

    New J. Chem. 雑誌 Royal Society of Chemistry   31   519 - 527   2007.04

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  • Antiferromagnetic or Canted Antiferromagnetic Orderings of Fe(III) d Spins of FeX4- Ions in BEDT-TTFVO(S)FeX4 (X = Cl, Br) [BEDT-TTFVO(S) = bis(ethylenedithio)tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiolemethide Reviewed

    M.-X. Wang, X.-W. Xiao, H. Fujiwara, T. Sugimoto, S. Noguchi, T. Ishida, T. Mori, H. Aruga-Katori

    Inorg. Chem. 雑誌 American Chemical Society   46   3049 - 3056   2007.04

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  • Metal-semiconductor structural phase transitions and antiferromagnetic orderings in (Benzo-TTFVO)2MX4 (M = Fe, Ga; X = Cl, Br) salts Reviewed

    T. Hiraoka, H. Fujiwara, T. Sugimoto, H. Nakazumi, S. Noguchi, A. Kuribayashi, T. Ishida, K. Yokogawa, K. Murata, T. Mori, H. Aruga-Katori, S. Kimura, M. Hagiwara

    J. Mater. Chem. 雑誌 Royal Society of Chemistry   17   1664 - 1673   2007.04

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  • Antiferromagnetic or canted antiferromagnetic orderings of Fe(III) d spins of FeX4- ions in BEDT-TTFVO(S)center dot FeX4 (X = Cl, Br) [BEDT-TTFVO(S) = bis(ethylenedithio)tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiolemethide] Reviewed

    Mingxing Wang, Xunwen Xiao, Hideki Fujiwara, Toyonari Sugimoto, Satoru Noguchi, Takekazu Ishida, Takehiko Mori, Hiroko Aruga Katori

    INORGANIC CHEMISTRY   46 ( 8 )   3049 - 3056   2007.04( ISSN:0020-1669

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    By the reaction of new donor molecules, bis(ethylenedithio)tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiolemethides [BEDT-TTFVO (1) and BEDT-TTFVS (2)] with FeX3 (X = Cl, Br) in CS2/CH3CN, 1:1 salts of 1 or 2 with an FeX4- ion (1 center dot FeX4 and 2 center dot FeX4) were obtained as black needle crystals. Their crystal structures are very similar to each other, in which the donor molecules are strongly dimerized and the dimers construct a one-dimensional uniform chain along the a axis, while the FeX4- ions are located at an open space surrounded by the neighboring donor molecules and also construct a one-dimensional uniform chain along the a axis. There are close contacts between the donor molecules and the FeX4- ions and significant differences in the contact distances among the four salts. All of the salts are semiconductors with room-temperature electrical conductivities of 10(-4)-10(-2) S cm(-1). The Fe(III) d spins of the FeX4- ions are subject to dominant ferromagnetic interaction through the participation of one of the singlet pi spins to form a short-range ferromagnetic d-spin chain. Such neighboring chains interact antiferromagnetically with each other through the singlet pi spins and are ordered at 1.0, 2.4, and 0.8 K for 1 center dot FeCl4, 1 center dot FeBr4, and 2 center dot FeCl4, respectively. On the other hand, the antiferromagnetic ordering occurred with some canted angle at 1.9 K to leave a small magnetization for 2 center dot FeBr4.

    DOI: 10.1021/ic0617700

    PubMed

  • Magnetic orderings of Fe3+ d spins in the 1:1 salts of BEDT-TTFVS(O) with FeX4 Reviewed

    S. Noguchi, A. Kuribayashi, M.-X. Wang, H. Fujiwara, T. Sugimoto, T. Ishida

    J. Mag. Mag. Mater. 雑誌 Elsevier   310   1087 - 1089   2007.03

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  • ESR study on π Reviewed

    T. Hayakawa, S. Kawamata, T. Hiraoka, H. Fujiwara, T. Sugimoto, T. Ishida

    J. Mag. Mag. Mater. 雑誌 Elsevier   310   1096 - 1098   2007.03

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  • Shubnikov Reviewed

    M. Teramura, S. Yasuzuka, H. Yoshino, K. Yokogawa, T. Sasaki, H. Fujiwara, T. Sugimoto, T. Hiraoka, T. Hayashi, K. Murata

    J. Mag. Mag. Mater. 雑誌 Elsevier   310   1093 - 1095   2007.03

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  • Occurrence of a rare 49-66 structural topology, chirality, and weak ferromagnetism in the [NH4][MII(HCOO)3] Reviewed

    Z.-M. Wang, B. Zhang, K. Inoue, H. Fujiwara, T. Otsuka, H. Kobayashi, M. Kurmoo

    Inorg. Chem. 雑誌 American Chemical Society   46   437 - 445   2007.01

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  • Magnetic Conductors Based on New Ethylenedioxy-Substituted Donors with a Bent Molecular Structure Reviewed

    H. Fujiwara, K. Wada, T. Hiraoka, T. Hayashi, T. Sugimoto, H. Nakazumi, M. Teramura, K. Yokogawa, S. Yasuzuka, K. Murata

    Multifunctional Conducting Molecular materials 著書 Royal Society of Chemistry   79   161 - 164   2007.01

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  • Occurrence of a rare 4(9)center dot 6(6) structural topology, chirality, and weak ferromagnetism in the [NH4][M-II(HCOO)(3)] (M = Mn, Co, Ni) frameworks Reviewed

    Zheming Wang, Bin Zhang, Katsuya Inoue, Hideki Fujiwara, Takeo Otsuka, Hayao Kobayashi, Mohamedally Kurmoo

    INORGANIC CHEMISTRY   46 ( 2 )   437 - 445   2007.01( ISSN:0020-1669

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    We report the synthesis, crystal structures, thermal, IR, UV-vis, and magnetic properties of a series of divalent transition metal formates, [NH4][M(HCOO)(3)], where M = divalent Mn, Co, or Ni. They crystallize in the hexagonal chiral space group P6(3)22. The structure consists of octahedral metal centers connected by the anti-anti formate ligands, and the ammonium cations sit in the channels. The chiral structure is a framework with the rarely observed 4(9)center dot 6(6) topology, and the chirality is derived from the handedness imposed by the formate ligands around the metals and the presence of units with only one handedness. The thermal properties are characterized by a decomposition at ca. 200 degrees C. The three compounds exhibit an antiferromagnetic ground state at 8.4, 9.8, and 29.5 K for Mn, Co, and Ni, respectively. The last two display a weak spontaneous magnetization due to a small canting of the moments below the critical temperature, and the Co compound shows a further transition at lower temperatures. The isothermal magnetizations at 2 K show spin-flop fields of 600 Oe (Mn), 14 kOe (Co), and above 50 kOe (Ni) and a small hysteresis with a remnant magnetization of 25 cm(3) G mol(-1) (Co) and 50 cm(3) G mol(-1) (Ni) and coercive field of 400 Oe (Co) and 830 Oe (Ni).

    DOI: 10.1021/ic0610031

    PubMed

  • Nanowires of molecule-based charge-transfer salts Reviewed

    Jean-Philippe Savy, Dominique de Caro, Christophe Faulmann, Lydie Valade, Manuel Almeida, Tadahiro Koike, Hideki Fujiwara, Toyonari Sugimoto, Jordi Fraxedas, Thierry Ondarcuhu, Claude Pasquier

    NEW JOURNAL OF CHEMISTRY   31 ( 4 )   519 - 527   2007( ISSN:1144-0546

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    Nanowires of molecule-based charge-transfer salts are prepared using two different processing techniques. Isolated [TTF][TCNQ] nanowires are grown by a simple adsorption in organic solution method on stainless steel conversion coatings, used as substrates. They are characterized by Raman spectroscopy and current - voltage measurements. Nanowire films of Per(2)[Au(mnt)(2)] and (EDT-TTFVO)(4)(FeCl(4))(2) are electrodeposited on ( 001)- oriented silicon wafers, used as anodes. In the second case, growth as nanowires occurs after functionalizing the Si electrode with a phospholipidic membrane. Electrodeposited nanowire films are studied by various techniques, including electron microscopy, vibrational spectroscopies, X-ray photoelectron spectroscopy and conductivity measurements.

    DOI: 10.1039/b618241k

  • Metal-semiconductor structural phase transitions and antiferromagnetic orderings in (Benzo-TTFVO)(2)center dot MX4 (M = Fe, Ga; X = Cl, Br) salts Reviewed

    Takashi Hiraoka, Hideki Fujiwara, Toyonari Sugimoto, Hiroyuki Nakazumi, Satoru Noguchi, Akihiro Kuribayashi, Takekazu Ishida, Keiichi Yokogawa, Keizo Murata, Takehiko Mori, Hiroko Aruga-Katori, Shojiro Kimura, Masayuki Hagiwara

    JOURNAL OF MATERIALS CHEMISTRY   17 ( 17 )   1664 - 1673   2007( ISSN:0959-9428

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    Crystals of the 2 : 1 salts of a new donor molecule, benzotetrathiafulvalenoquinone-1,3-dithiolemethide ( 4, Benzo-TTFVO) with magnetic FeX4- and non-magnetic GaX4- ( X = Cl, Br) ions, 4(2) center dot FeX4 and 4(2) center dot GaX4, are isostructural to each other and showed a beta-type packing of the donor molecules where they form a uniform-stacked structure with an interplanar distance of 3.50 angstrom. These salts exhibited metallic behavior down to 140 - 170 K, but at these temperatures (similar to TM-I) an abrupt increase in the resistivities (rho) occurred and thereafter semiconducting behavior with an activation energy of 40 - 100 meV was observed. A structural change in the donor column from uniform to tetramer-unit stacks was observed in the 4(2) center dot FeBr4 crystal before and after TM-I. By application of pressures up to 1.0 GPa, the metallic behavior in the higher temperature region was gradually strengthened and TM-I gradually became lower with increasing pressure, but the transitions could not be suppressed at all. In response to the metal semiconductor transition at TM-I, there was a sharp decrease in the paramagnetic susceptibility of the pi electron system, where the transition from Pauli paramagnetism due to the metal-conducting behavior to the spin singlet state caused by tetramer formation of the donor molecules was observed. In addition, the FeX4- ( X = Cl, Br) salts showed comparatively strong antiferromagnetic interactions between the Fe( III) d spins of the FeCl4- and FeBr4- ions ( Weiss temperature: -11 K for 4(2) center dot FeCl4 and -37 K for 4(2) center dot FeBr4), giving rise to antiferromagnetic orderings at 1.6 K for 4(2) center dot FeCl4 and 9.3 K for 4(2) center dot FeBr4. The magnitudes of the d - d and pi - d interactions in 4(2) center dot FeBr4 are calculated to be J(dd) = 2.06 K and J(pi d) = 2.32 K, respectively. The comparison of these J values with the other magnetic conductors based on our system suggests that the d - d interaction of 4(2) center dot FeBr4 is stronger than the pi - d interaction. Since the three-dimensional antiferromagnetic ordering appears at the comparatively high temperature of 9.3 K, there is an important contribution of the pi electrons to the antiferromagnetic ordering of the Fe( III) d spins in order to mediate the magnetic interaction between two-dimensional magnetic anion layers.

    DOI: 10.1039/b612053a

  • High field magnetization of (Benzo-TTFVS)2FeBr4 and (Benzo-TTFVO)2FeBr4 Reviewed

    S. Noguchi, A. Kuribayashi, T. Hiraoka, H. Fujiwara, T. Sugimoto, S. Kimura, M. Hagiwara, K. Kindo, T. Ishida

    Journal of Physics: Conference Series 雑誌 IOP Publishing   51   331 - 334   2006.12

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  • Isotropic magnetoresistance anomaly in the antiferromagnetic anisotropic conductor, b Reviewed

    M. Teramura, S. Yasuzuka, H. Yoshino, T. Sasaki, H. Fujiwara, T. Sugimoto, T. Hiraoka, T. Hayashi, K. Murata

    Journal of Physics: Conference Series 雑誌 IOP Publishing   51   367 - 370   2006.12

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  • Magnetic ground state of quasi-two-dimensional organic conductor, t-(EDO-S,S-DMEDT-TTF)2(AuCl2)1+y Reviewed

    T. Nakanishi, S. Yasuzuka, H. Yoshino, H. Fujiwara, T. Sugimoto, Y. Nishio, K .Kajita, G. A. Anyfantis, G. C. Papavassiliou, K. Murata

    Journal of Physics: Conference Series 雑誌 IOP Publishing   51   343 - 346   2006.12

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  • A New Ferromagnetic Organic Semiconductor BEDT-TTFVS-FeBr4 Reviewed

    S. Noguchi, T. Kosaka, M. Wang, H. Fujiwara, T. Sugimoto, T. Ishida

    AIP Conf. Proc. 著書 American Institute of Physics   850   1063 - 1064   2006.09

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  • A Metallic (EDT-DSDTFVSDS)2FeBr4 Salt: Antiferromagnetic Ordering of d Spins of FeBr4- Ions and Anomalous Magnetoresistance due to Preferential pi-d Interaction Reviewed

    T. Hayashi, X.-W. Xiao, H. Fujiwara, T. Sugimoto, H. Nakazumi, S. Noguchi, T. Fujimoto, S. Yasuzuka, H. Yoshino, K. Murata, T. Mori, H. Aruga-Katori

    J. Am. Chem. Soc. 雑誌 American Chemical Society   128   11746 - 11747   2006.09

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  • Fermi Surface and Electronic Properties of kappa-(BETS)2FeCl4 Reviewed

    T. Konoike, S. Uji, T. Terashima, M. Nishimura, T. Yamaguchi, K. Enomoto, H. Fujiwara, B. Zhang, H. Kobayashi

    AIP Conf. Proc. 著書 American Institute of Physics   850   621 - 622   2006.09

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  • A metallic (EDT-DSDTFVSDS)(2)center dot FeBr4 salt: Antiferromagnetic ordering of d spins of FeBr4- ions and anomalous magnetoresistance due to preferential pi-d interaction Reviewed

    Toshiki Hayashi, Xunwen Xiao, Hideki Fujiwara, Toyonari Sugimoto, Hiroyuki Nakazumi, Satoru Noguchi, Tsutomu Fujimoto, Syuma Yasuzuka, Harukazu Yoshino, Keizo Murata, Takehiko Mori, Hiroko Aruga-Katori

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   128 ( 36 )   11746 - 11747   2006.09( ISSN:0002-7863

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    DOI: 10.1021/ja064307v

    PubMed

  • Magnetoresistance Effects Evidencing the pi-d Interaction in Metallic Organic Conductors, (EDT-DSDTFVO)2MX4 (M = Fe, Ga; X = Cl, Br) Reviewed

    H. Fujiwara, T. Hayashi, T. Sugimoto, H. Nakazumi, S. Noguchi, L. Li, K. Yokogawa, S. Yasuzuka, K. Murata, T. Mori

    Inorg. Chem. 雑誌 American Chemical Society   45   5712 - 5714   2006.07

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  • Magnetoresistance effects evidencing the pi-d interaction in metallic organic conductors, (EDT-DSDTFVO)(2)center dot MX4 (M = Fe, Ga; X = Cl, Br) Reviewed

    Hideki Fujiwara, Toshiki Hayashi, Toyonari Sugimoto, Hiroyuki Nakazumi, Satoru Noguchi, Lin Li, Keiichi Yokogawa, Syuma Yasuzuka, Keizo Murata, Takehiko Mori

    INORGANIC CHEMISTRY   45 ( 15 )   5712 - 5714   2006.07( ISSN:0020-1669

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ic060034t

    PubMed

  • Compensation of effective field in the field-induced superconductor kappa-(BETS)2FeBr4 observed by 77Se NMR Reviewed

    S. Fujiyama, M. Takigawa, J. Kikuchi, H-B. Cui, H. Fujiwara, H. Kobayashi

    Phys. Rev. Lett. 雑誌 Americal Physical Society   96   2006.05

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  • BDT-TTP-Based pi-Conductors Containing Divalent Magnetic and Non-Magnetic Inorganic Anions, [MIICl4]2- (M = Co, Mn, Zn) Reviewed

    T. Kusamoto, E. Fujiwara, A. Kobayashi, H. Cui, T. Otsuka, Y. Okano, H. Fujiwara, and H. Kobayashi

    Bull. Chem. Soc. Jpn. 雑誌 日本化学会   79   527 - 536   2006.04

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  • BDT-TTP-Based pi conductors containing divalent magnetic and non-magnetic inorganic anions, [(MCl4)-Cl-II](2-) (M = Co, Mn, Zn) Reviewed

    Tetsuro Kusamoto, Emiko Fujiwara, Akiko Kobayashi, Hengbo Cui, Takeo Otsuka, Yoshinori Okano, Hideki Fujiwara, Hayao Kobayashi

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   79 ( 4 )   527 - 536   2006.04( ISSN:0009-2673

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    Three BDT-TTP [2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene] salts, (BDT-TTP)(3)[(MCl4)-Cl-II](EtOH)(x) (M = Co, Mn, and Zn; x approximate to 1.0) were prepared. These salts are almost isostructural to one another. The crystals are composed of BDT-TTP columns, "BDT-TTP tapes" that occupy the interstitial positions between BDT-TTP columns [(MCl4)-Cl-II](2-) anions and the crystal solvents, respectively. These salts showed weakly metallic conducting behavior down to about 150 K. At low temperature, the resistivities increased gradually with decreasing temperature, but the systems retained fairly high conductivities even at around 30 K. The [Z(II)Cl(4)](2-) salt indicated temperature independent paramagnetism down to low temperature. While the susceptibilities of the [(CoCl4)-Cl-II](2-) and [(MnCl4)-Cl-II](2-) salts showed the coexistence of pi conduction electrons and localized high-spins of the magnetic Co-II and Mn-II atoms. no significant pi-d interaction was observed. Band structure calculations were performed with taking account of the possibility of inhomogeneous distribution of pi electrons over the crystallographically independent three BDT-TTP molecules. The system has wide and narrow one-dimensional bands that originate from BDT-TTP columns and tapes, respectively. However, due to the interaction between BDT-TTP columns and tapes, the system gave a unique two-dimensional electronic band. The calculated energy dispersion curves were consistent with the weakly metallic behavior of the systems.

    DOI: 10.1246/bcsj.79.527

  • Anomalous Magnetic-Field-Hysteresis of Quantum Oscillations in k-(BETS)2FeBr4 Reviewed

    T. Konoike, S. Uji, T. Terashima, M. Nishimura, T. Yamaguchi, K. Enomoto, H. Fujiwara, B. Zhang, and H. Kobayashi

    J. Low Temp. Phys. 雑誌 Springer   142   527 - 530   2006.02

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  • An Antiferromagnetic Semiconductor Based on Ethylenedioxytetrathiafulvalenothioquinone-1,3-dithiolemethide, (EDO-TTFVS)FeBr4 Reviewed

    H. Fujiwara, K. Wada, T. Hiraoka, T. Hayashi, T. Sugimoto, H. Nakazumi

    J. Low Temp. Phys. 雑誌 Springer   142   401 - 404   2006.02

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  • Magnetic Ion Salts Using Selenium Analogues of a New Donor Molecule, Benzotetrathiafulvalenothioquinone-1,3-dithiolemethide Reviewed

    T. Hiraoka, H. Fujiwara, T. Sugimoto, L. Li, Y. Weng, K. Yokogawa, K. Murata

    J. Low Temp. Phys. 雑誌 Springer   142   433 - 436   2006.02

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  • Evidence for the pi-d Interaction Comparing Magneto- resistance in (EDT- DSDTFVO)2X, X=FeCl4, GaCl4 Reviewed

    L. Li, S. Yasuzuka, Y. Weng, K. Yokogawa, T. Fujimoto, T. Sugimoto, H. Fujiwara, T. Hayashi, T. Hiraoka, K. Murata

    J. Low Temp. Phys. 雑誌 Springer   142   469 - 472   2006.02

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  • Field-Induced Anomaly in the Magnetoresistance of (EDO-TTFVO)2FeCl4 below 1.5 K Reviewed

    M. Teramura, K. Yokogawa, S. Yasuzuka, T. Sasaki, K. Wada, T. Hiraoka, T. Hayashi, H. Fujiwara, T. Sugimoto, K. Murata

    J. Low Temp. Phys. 雑誌 Springer   142   485 - 489   2006.02

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  • Pressure Effect on Insulating State in Ferrimagnetic pi-d System (EDT-TTFVO)2FeBr4 Reviewed

    T. Fujimoto, S. Yasuzuka, K. Yokogawa, T. Hayashi, T. Hiraoka, H. Fujiwara, T. Sugimoto, M. Hedo, Y. Uwatoko, K. Murata

    J. Low Temp. Phys. 雑誌 Springer   142   613 - 616   2006.02

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  • Magnetic Organic Conductor Based on a pi Donor with a Stable Radical and a Magnetic Anion - A Step to Magnetic Organic Metals with Two Kinds of Localized Spin Systems Reviewed

    S. Otsubo, H.-B. Cui, H.-J. Lee, H. Fujiwara, K. Takahashi, Y. Okano, H. Kobayashi

    Chem. Lett. 雑誌 Chemical Society of Japan   35   130 - 131   2006.01

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  • A magnetic organic conductor based on a pi donor with a stable radical and a magnetic anion - A step to magnetic organic metals with two kinds of localized spin systems Reviewed

    S Otsubo, HB Cui, HJ Lee, H Fujiwara, K Takahashi, Y Okano, H Kobayashi

    CHEMISTRY LETTERS   35 ( 1 )   130 - 131   2006.01( ISSN:0366-7022

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    (TTP-PROXYL)FeCl4, where TTP-PROXYL is 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (TTP) incorporating the 2,2,5,5-tetramethyl-1-pyrrolidinyloxy (PROXYL) radical, is a semiconductor with two kinds of localized spin systems, that is, the systems of organic radical spins and 3d spins of magnetic FeCl4- ions. The 7 spin of the TTP-PROXYL radical cation disappears due to dimerization but the chi T-value of 4.65 Kemu mol(-1) indicates the coexistence of high-spin Fe3+ (S = 5/2) and PROXYL radical (S = 1/2) ill this salt. (TTP-PROXYL)GaCl4 is isostructural to the FeCl4 salt and exhibited similar semiconducting properties.

    DOI: 10.1246/cl.2006.130

  • A new ferromagnetic organic semiconductor (BEDT-TTFVS)center dot FeBr4 Reviewed

    Noguchi Satoru, Kosaka Tomoyuki, Wang Mingxing, Fujiwara Hideki, Sugimoto Toyonari, Ishida Takekazu

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   1063 - +   2006( ISSN:0094-243X

  • Fermi surface and electronic properties of kappa-(BETS)2FeCl4 Reviewed

    T. Konoike, S. Uji, T. Terashima, M. Nishimura, T. Yamaguchi, K. Enomoto, H. Fujiwara, B. Zhang, H. Kobayashi

    LOW TEMPERATURE PHYSICS, PTS A AND B   850   621 - +   2006( ISSN:0094-243X

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    Shubnikov-de Haas (SdH) and angular dependent magnetoresistance oscillations are measured in the organic conductor kappa-(BETS)(2)FeCl4. This salt has a quasi-two dimensional Fermi surface, which is almost consistent with the band structure calculation. The SdH oscillations suggest the presence of a large internal field of 10.6 T. The ratio of the interlayer to intralayer transfer integral is estimated as 1/146 from the width of the coherence peak.

  • Estimation of pid-interactions in magnetic molecular conductors Reviewed

    T. Mori, M. Katsuhara, H. Akutsu, K. Kikuchi, J. Yamada, H. Fujiwara, T. Matsumoto, T. Sugimoto

    Polyhedron 雑誌 Elsevier Science Ltd.   24   2315 - 2320   2005.11

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  • Stable Metallic Behavior and Antiferromagnetic Ordering of Fe(III) d Spins in (EDO-TTFVO)2FeCl4 Reviewed

    H. Fujiwara, K. Wada, T. Hiraoka, T. Hayashi, T. Sugimoto, H. Nakazumi, K. Yokogawa, M. Teramura, S. Yasuzuka, K. Murata, T. Mori

    J. Am. Chem. Soc. 雑誌 American Chemical Society   127   14166 - 14167   2005.10

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  • Stable metallic behavior and antiferromagnetic ordering of Fe(III) d spins in (EDO-TTFVO)(2)center dot FeCl4 Reviewed

    H Fujiwara, K Wada, T Hiraoka, T Hayashi, T Sugimoto, H Nakazumi, K Yokogawa, M Teramura, S Yasuzuka, K Murata, T Mori

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   127 ( 41 )   14166 - 14167   2005.10( ISSN:0002-7863

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    DOI: 10.1021/ja055263d

    PubMed

  • Metallic/semiconducting behaviors and an antiferromagnetic ordering of FeBr4- d spins in (Benzo-TTFVS)2MX4 (M = Fe, Ga; X = Cl, Br) Reviewed

    T. Hiraoka, Y. Kamada, T. Matsumoto, H. Fujiwara, T. Sugimoto, S. Noguchi, T. Ishida, H. Nakazumi and H. Aruga Katori

    J. Mater. Chem. 雑誌 American Chemical Society   15   3479 - 3487   2005.09

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  • Fermi surface reconstruction in the magnetic-field-induced superconductor kappa-(BETS)2FeBr4 Reviewed

    T. Konoike, S. Uji, T. Terashima, M. Nishimura, S. Yasuzuka, K. Enomoto, H. Fujiwara, E. Fujiwara, B. Zhang, and H. Kobayashi

    Phys. Rev. B 雑誌 American Physical Society   B72   2005.09

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  • Nuclear spin-lattice relaxation in kappa-(BETS)2FeBr4 Reviewed

    S. Fujiyama, M. Takigawa, J. Kikuchi, K. Kodama, T. Nakamura, E. Fujiwara, H. Fujiwara, H.-B. Cui, H. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   154   253 - 256   2005.09

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  • Molecular Conductors Based on peri-Ditellurium Bridged Donors, 2,3-DMTTeA and TMTTeN Reviewed

    E. Fujiwara, H. Fujiwara, B. Zh. Narymbetov, H. Kobayashi, M. Nakata, H. Torii, A. Kobayashi, K. Takimiya, T. Otsubo, F. Ogura

    Eur. J. Inorg. Chem. 雑誌 Wiley-VCH   3435 - 3449   2005.09

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  • TTF [FeIII(C2O4)Cl2]: An Organic-Inorganic Hybrid Exhibiting Canted Antiferromagnetism Reviewed

    B. Zhang, Z.-M. Wang, H. Fujiwara, H. Kobayashi, M. Kurmoo, K. Inoue, T. Mori, S. Gao, Y. Zhang, D.-B. Zhu

    Adv. Mater 雑誌 Wiley-VCH   17   1988 - 1991   2005.08

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  • Development of an Antiferromagnetic Organic Superconductor kappa-(BETS)2FeBr4 Reviewed

    H. Fujiwara, H. Kobayashi

    Bull. Chem. Soc. Jpn. 雑誌 Chemical Society of Japan   78   1181 - 1196   2005.07

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  • Development of an antiferromagnetic organic superconductor kappa-(BETS)(2)FeBr4 Reviewed

    H Fujiwara, H Kobayashi

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   78 ( 7 )   1181 - 1196   2005.07( ISSN:0009-2673

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    The first antiferromagnetic organic superconductor, kappa-(BETS)(2)FeBr4 [BETS = bis(ethylenedithio)tetraselenafulvalene], was developed in the search for novel magnetic molecular conductors. This salt shows successive antiferromagnetic and superconducting transitions at T-N = 2.5 K and T-c = 1.1 K, respectively, at ambient pressure. Specific heat measurements and anisotropic behavior of intraplanar conducting properties under applied magnetic fields prove the coexistence of the antiferromagnetic ordering and superconductivity below T-c. The combination of metamagnetism of the magnetic layer and superconductivity of the conduction layer, which makes this salt a dual-functional system, yields two characteristic magnetic field-induced superconducting states around 1.6 and 12.5 T in terms of the Jaccarino-Peter compensation effect. Systematic studies on both the chemical pressure effect by a halogen exchange in the alloy system kappa-(BETS)(2)FeBCl4-x and the physical pressure effect by an application of real pressures in kappa-(BETS)(2)FeBr4 were performed to discuss the pi-d interaction in the kappa-(BETS)(2)FeBr4 system.

    DOI: 10.1246/bcsj.78.1181

  • Magnetic properties of field-induced superconductor, kappa-(BETS)2FeBr4 Reviewed

    T. Konoike, S. Uji, M. Nishimura, K. Enomoto, H. Fujiwara, B. Zhang, H. Kobayashi

    Physica B 雑誌 Elsevier Science Ltd.   359   457 - 459   2005.04

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  • Ferromagnetic Ordering of Fe(III) d Spins of FeBr4- Ions in (Ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide)FeBr4 Reviewed

    M. -X. Wang, H. Fujiwara, T. Sugimoto, S. Noguchi, T. Ishida

    Inorg. Chem. 雑誌 American Chemical Society   44   1184 - 1186   2005.03

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  • Synthesis and characterization of a porous magnetic diamond framework, Co3(HCOO)6, and its N-2 sorption characteristic Reviewed

    Z.-M. Wang, B. Zhang, M. Kurmoo, M. A. Green, H. Fujiwara, T. Otsuka, H. Kobayashi

    Inorg. Chem. 雑誌 American Chemical Society   44   1230 - 1237   2005.03

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  • Synthesis and characterization of a porous magnetic diamond framework, Co-3(HCOO)6, and its N-2 sorption characteristic Reviewed

    ZM Wang, B Zhang, M Kurmoo, MA Green, H Fujiwara, T Otsuka, H Kobayashi

    INORGANIC CHEMISTRY   44 ( 5 )   1230 - 1237   2005.03( ISSN:0020-1669

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    [Co-3(HCOO)(6)](CH3OH)(H2O) (1), the isostructural analogue of the porous magnet of coordination framework [Mn-3(HCOO)(6)](CH3OH)(H2O), and its desolvated form [Co-3(HCOO)(6)] (2) were prepared and characterized by X-ray and neutron diffraction methods, IR, thermal analyses, and BET, and their magnetic properties were measured. The parent compound, 1, crystallizes in the monoclinic system, space group P2(1)/c, a = 11.254(2) Angstrom, b = 9.832(1) Angstrom, c = 18.108(3) Angstrom, beta = 127.222(2)degrees, V = 1595.5(4) Angstrom(3), Z = 4, R1 = 0.0329 at 180 K. It possesses a unit cell volume that is 9% smaller than [Mn-3(HCOO)(6)](CH3OH)(H2O) due to the smaller radius of CO2+ ion. Compared with the parent compound 1, the desolvated compound 2 has slightly larger lattice with cell parameters of a = 11.2858(4) Angstrom, b = 9.8690(4) Angstrom, c = 18.1797(6) Angstrom, beta = 127.193(2)degrees, V = 1613.0(1) Angstrom(3), R1 = 0.0356 at 180 K. The cell parameters of 2, obtained from neutron powder data at 2 K, are a = 11.309(2) Angstrom, b = 9.869(1) Angstrom, c = 18.201(3) Angstrom, beta = 127.244(8)degrees, V = 1617.3(5) Angstrom(3). The pore volume reduces from 33% to 30% by replacing Mn by Co. The material exhibits a diamond framework based on Co-centered CoCo4 tetrahedral nodes, in which all metal ions have octahedral coordination geometry and all HCOO groups link the metal ions in syn-syn/anti modes. It displays thermal stability up to 270 degreesC. The compound easily loses guest molecules without loss of crystallinity, and it partly reabsorbs water from the atmosphere. Significant N-2 sorption was observed for the desolvated framework suggesting that the material possesses permanent porosity. The magnetic properties show a tendency to a 3D long-range magnetic ordering, probably antiferromagnetic with a spin canting arrangement below 2 K.

    DOI: 10.1021/ic048986r

    PubMed

  • Ferromagnetic ordering of Fe(III) d spins of FeBr4- ions in (Ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide)-FeBr4 Reviewed

    MX Wang, H Fujiwara, T Sugimoto, S Noguchi, T Ishida

    INORGANIC CHEMISTRY   44 ( 5 )   1184 - 1186   2005.03( ISSN:0020-1669

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    The 1:1 salt of a new donor molecule, ethylenedithiotetrathiaful-valenothioquinone-ethylenedithio-1,3-dithiolemethide (1), with FeBr4- ion, 1.FeBr4, was prepared and found to exhibit a room-temperature electrical conductivity of 4 x 10(-2) S cm(-1) and semiconducting behavior with an activation energy of 170 meV. The paramagnetic susceptibility obeyed the Curie-Weiss law with a Curie constant of 4.42 emu K mol(-1) and a Weiss temperature of +3.4 K, and below 15 K, this short-range ferromagnetic interaction increasingly extended to two- and/or three-dimensional interactions, eventually giving rise to a ferromagnetic ordering, whose temperature (T-C) was determined to be 1.8 +/- 0.2 K using a resonant circuit method. The magnetic field dependence of magnetization showed that the saturation of magnetization was accomplished at ca. 60 kOe and the saturated value was ca. 5 mu(B), which is very close to the value obtained only due to Fe(III) (S = 5/2) d spins of one FeBr4- ion.

    DOI: 10.1021/ic0482988

    PubMed

  • Crystal structures and physical properties of single-component molecular conductors consisting of nickel and gold complexes with bis(trifluoromethyl)tetrathiafulvalenedithiolate ligands Reviewed

    M. Sasa, E. Fujiwara, A. Kobayashi, S. Ishibashi, K. Terakura, Y. Okano, H. Fujiwara, H. Kobayashi

    J. Mater. Chem. 雑誌 American Chemical Society   15   155 - 163   2005.01

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  • Crystal structures and physical properties of single-component molecular conductors consisting of nickel and gold complexes with bis(trifluoromethyl)tetrathiafulvalenedithiolate ligands Reviewed

    M Sasa, E Fujiwara, A Kobayashi, S Ishibashi, K Terakura, Y Okano, H Fujiwara, H Kobayashi

    JOURNAL OF MATERIALS CHEMISTRY   15 ( 1 )   155 - 163   2005( ISSN:0959-9428

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    The neutral nickel and gold complexes with bis(trifluoromethyl)tetrathiafulvalenedithiolate ligands, [M(hfdt)(2)] (M = Ni, Au) were prepared in order to examine the possibility of the development of single-component molecular conductors soluble in organic solvents. However, in contrast to the previous report, the crystals did not show any solubility in the usual organic solvents. On the other hand, the crystal structure analyses showed unique two-dimensional layered structures, despite that the single-component molecular conductors usually tend to take a compact three-dimensional molecular arrangement. Each layer is separated by the terminal CF3 groups to form the "CF3 bilayer structure". The shortest intermolecular F...F distance (3.018 Angstrom for [Ni(hfdt)(2)] and 2.862 Angstrom for [Au(hfdt)(2)]) is significantly longer than the van der Waals F...F distance (2.70 Angstrom) and the distribution of the frontier electrons is almost zero around the CF3 bilayer region. This is due to the strong F. F segregation effect, which will provide a useful way to control the molecular aggregation in the single-component molecular conductors. Extended-Huckel tight-binding band structure calculations and the ab initio local density approximation (LDA) band structure calculations were made for [Ni(hfdt)(2)], which explains the semiconducting and non-magnetic properties of the system. Extended-Huckel tight-binding band structure calculations were also made for [Au(hfdt)(2)]. The calculated band structure is consistent with the semiconducting and almost non-magnetic properties of [Au(hfdt)(2)].

    DOI: 10.1039/b413597k

  • Metallic/semiconducting behaviors and an antiferromagnetic ordering of FeBr(4)(_)(-)d spins in (Benzo-TTFVS)(2)(MX4)-M-. (M = Fe, Ga; X = Cl, Br) Reviewed

    T Hiraoka, Y Kamada, T Matsumoto, H Fujiwara, T Sugimoto, S Noguchi, T Ishida, H Nakazumi, HA Katori

    JOURNAL OF MATERIALS CHEMISTRY   15 ( 34 )   3479 - 3487   2005( ISSN:0959-9428

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    The 2 : 1 salts of a new donor molecule, benzotetrathiafulvalenothioquinone-1,3-dithiolemethide (Benzo-TTFVS) with magnetic FeCl4- and FeBr4- ions, and with non-magnetic GaCl4- and GaBr4- ions were obtained as single crystals by an electrochemical oxidation method. All of the crystals have very similar structures to each other, in which two different layers of the donor molecules and the counteranions are stacked alternately, although the separation distance between the neighboring donor layers in the FeCl4- and GaCl4- salts is shorter by 0.43-0.47 angstrom than that in the FeBr4- and GaBr4- salts. The donor molecules formed a beta-like stacking structure with almost the same interplanar distances and effective overlaps along the stacking direction, such that these salts showed high electrical conductivities (9-33 S cm(-1)) at room temperature, as well as metallic behavior. However, owing to a quasi one-dimensional character of the calculated band structures, a transition of metal-to-semiconductor with a very small activation energy of &lt; 30 meV occurred at comparatively high temperatures of 100-150 K. The Fe(III) d spins of the FeCl4- ions were subject to weakly antiferromagnetic interaction (Weiss temperature, theta = -4.3 K). While, the interaction between the Fe(III) d spins of the FeBr4- ions was fairly strong (theta = -16.1 K), eventually giving rise to an antiferromagnetic ordering at the temperature of 5.8 K. In the magnetization measurement of the FeBr4- salt up to 320 kOe at 0.5 K, a spin-flop occurred near 20 kOe and a saturation near 156 kOe.

    DOI: 10.1039/b506725a

  • Magnetic-field-induced superconductivity in the antiferromagnetic organic superconductor Reviewed

    T. Konoike, S. Uji, T. Terashima, M. Nishimura, S. Yasuzuka, K. Enomoto, H. Fujiwara, B. Zhang, and H. Kobayashi

    Phys. Rev. B 雑誌 American Physical Society   B70   2004.10

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  • Fermi surface in magnetic-field-induced superconductor kappa-(BETS)2FeBr4 Reviewed

    T. Konoike, H. Fujiwara, B. Zhang, H. Kobayashi, M. Nishimura, S. Yasuzuka, K. Enomoto, S. Uji

    Physica C 雑誌 Elsevier Science Ltd.   412-414   107 - 110   2004.10

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  • Strong evidence of field-induced superconductivity and Shubnikov-de Haas oscillation in kappa-(BETS)2FeBr4 Reviewed

    T. Konoike, H. Fujiwara, B. Zhang, H. Kobayashi, M. Nishimura, S. Yasuzuka, K. Enomoto, S. Uji

    Journal de Physique IV 雑誌 EDP Sciences   114   223 - 226   2004.10

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  • Synthesis, Structures and Physical Properties of a New Organic Conductor Based on a p-Extended Donor Containing a Stable PROXYL Radical Reviewed

    H. Fujiwara, H.-J. Lee, H.-B. Cui, H. Kobayashi, E. Fujiwara, A. Kobayashi

    Adv. Mater. 雑誌 Wiley-VCH   16   1765 - 1769   2004.10

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  • Novel p-Extended Donors Containing a 2,2,5,5-Tetramethylpyrrolin-1-yloxyl Radical Designed for Magnetic Molecular Conductors Reviewed

    E. Fujiwara, A. Kobayashi, H. Fujiwara, T. Sugimoto, H. Kobayashi

    Chem. Lett. 雑誌 Chemical Society of Japan   33   964 - 965   2004.08

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  • Novel pi-extended donors containing a 2,2,5,5-tetramethylpyrrolin-1-yloxyl radical designed for magnetic molecular conductors Reviewed

    E Fujiwara, A Kobayashi, H Fujiwara, T Sugimoto, H Kobayashi

    CHEMISTRY LETTERS   33 ( 8 )   964 - 965   2004.08( ISSN:0366-7022

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    We synthesized pi-extended donors for magnetic conductors that contain a stable 2,2,5,5-tetramethylpyrrolin-1-yloxyl radical, and cleared their structure and physical properties. We also discussed the conducting and magnetic properties of cation radical salts of the synthesized donor.

    DOI: 10.1246/cl.2004.964

  • The pressure effect on the antiferromagnetic and superconducting transitions of kappa-(BETS)2FeBr4, T. Otsuka, H.-B. Cui, H. Fujiwara, H. Kobayashi, E. Fujiwara, A. Kobayashi Reviewed

    T. Otsuka, H.-B. Cui, H. Fujiwara, H. Kobayashi, E. Fujiwara, A. Kobayashi

    J. Mater. Chem. 雑誌 American Chemical Society   14   1682 - 1685   2004.05

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  • Recent progress in development of single-component molecular metals Reviewed

    A. Kobayashi, E. Fujiwara, W. Suzuki, M. Sasa, Y. Fujishiro, E. Nishibori, M. Takata, M. Sakata, Y. Okano, H. Fujiwara, H. Kobayashi

    Journal de Physique IV 雑誌 EDP Sciences   114   419 - 424   2004.04

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  • Development of new magnetic organic conductors based on donor molecules with stable organic radical part Reviewed

    H.-J. Lee, H.-B. Cui, H. Fujiwara, H. Kobayashi, E. Fujiwara, A. Kobayashi

    Journal de Physique IV 雑誌 EDP Sciences   114   533 - 535   2004.04

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  • Syntheses, Structures, and Physical Properties of Nickel Bis(dithiolene) Complexes Containing Tetrathiafulvalene (TTF) Units Reviewed

    E. Fujiwara, A. Kobayashi, H. Fujiwara, H. Kobayashi

    Inorg. Chem. 雑誌 American Chemical Society   43   1122 - 1129   2004.02

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  • Mn3(HCOO)6: a 3D porous magnet of diamond framework with nodes of Mn-centered MnMn4 tetrahedron and guest-modulated ordering temperature Reviewed

    Z.-M. Wang, B. Zhang, H. Fujiwara, H. Kobayashi, M. Kurmoo

    Chem. Commun. 雑誌 Royal Society of Chemistry   416 - 417   2004.02

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  • Syntheses, structures, and physical properties of nickel bis(dithiolene) complexes containing tetrathiafulvalene (TTF) units Reviewed

    E Fujiwara, A Kobayashi, H Fujiwara, H Kobayashi

    INORGANIC CHEMISTRY   43 ( 3 )   1122 - 1129   2004.02( ISSN:0020-1669

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    To contribute to the development of single-component molecular metals, several nickel complexes with cyclohexeno-condensed or ethylenedioxy-substituted TTF (tetrathiafulvalene) dithiolate ligands, (R4N)(n)[Ni(chdt)(2)] [R = Me, n = 2 (1); R = Bu-n, n = 1 (2); n = 0 (3)] and (R4N)(n)[Ni(eodt)(2)] [R = Me, n = 2 (4); R = Bu-n, n = 1 (5); n = 0 (6)], were prepared. X-ray structures were determined on the monoanionic species 2 and 5. The tetra-n-butylammonium complex of the monoanionic [Ni(chdt)21 (2) with a 1:1 composition revealed that its magnetic susceptibility gave a good agreement with the Bonner-Fisher model (J/k(B) = -28 K), which was derived from the one-dimensional chains of anions with a regular interval. On the other hand, the magnetic susceptibility of the tetra-n-butylammonium complex of the monoanionic [Ni(eodt)(2)] (5) showed the Curie-Weiss behavior (C = 0.376 K(.)emu(.)mol(-1) and Theta = -4.6 K). Both of the monoanionic species 2 and 5 indicate that they belong to the S = 1/2 magnetic system and have relatively large and anisotropic g-values, suggesting the contribution of the nickel 3d orbital. Electrical resistivity measurements were performed on the compressed pellets of the neutral species 3 and 6. Fairly large conductivities were obtained (sigma(n) = 1-10 S(.)cm(-1)). In addition, despite the measurements on the compressed pellets of powder samples, the neutral species 6 showed metallic behavior down to ca. 120 K and retained high conductivity even at 0.6 K [sigma(0.6 K)/sigma(rt) approximate to 1/30], suggesting the crystal to be essentially metallic down to very low temperature. The electrical behavior and Pauli paramagnetism of 6 indicate the system to be a new single-component metal.

    DOI: 10.1021/ic034670s

    PubMed

  • Mn-3(HCOO)(6): a 3D porous magnet of diamond framework with nodes of Mn-centered MnMn4 tetrahedron and guest-modulated ordering temperature Reviewed

    ZM Wang, B Zhang, H Fujiwara, H Kobayashi, M Kurmoo

    CHEMICAL COMMUNICATIONS   ( 4 )   416 - 417   2004.02( ISSN:1359-7345

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    Mn-3(HCOO)(6), a 3D highly stable and flexible porous diamondoid framework based on Mn-centered MnMn4 tetrahedral nodes, exhibits a wide spectrum of guest inclusion behaviour and long-range magnetic ordering with guest-modulated critical temperature.

    DOI: 10.1039/b314221c

    PubMed

  • Infrared Electronic Absorption in a Single-Component Molecular Metal Reviewed

    A. Kobayashi, M. Sasa, W. Suzuki, E. Fujiwara, H. Tanaka, M. Tokumoto, Y. Okano, H. Fujiwara, H. Kobayashi

    J. Am. Chem. Soc 雑誌 American Chemical Society   126   426 - 427   2004.01

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  • Infrared electronic absorption in a single-component molecular metal Reviewed

    A Kobayashi, M Sasa, W Suzuki, E Fujiwara, H Tanaka, M Tokumoto, Y Okano, H Fujiwara, H Kobayashi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   126 ( 2 )   426 - 427   2004.01( ISSN:0002-7863

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    DOI: 10.1021/ja0379767

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  • The pressure effect on the antiferromagnetic and superconducting transitions of kappa-(BETS)(2)FeBr4 Reviewed

    T Otsuka, HB Cui, H Fujiwara, H Kobayashi, E Fujiwara, A Kobayashi

    JOURNAL OF MATERIALS CHEMISTRY   14 ( 11 )   1682 - 1685   2004( ISSN:0959-9428

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    The temperature-pressure phase diagram of the first antiferromagnetic organic superconductor kappa-(BETS)(2)FeBr4 shows that the Neel temperature increases with pressure, while the superconducting transition temperature decreases rapidly around 3 kbar.

    DOI: 10.1039/b404004j

  • Development of single-component molecular metals and magnetic molecular superconductors Reviewed

    H Kobayashi, Y Okano, H Fujiwara, H Tanaka, M Tokumoto, W Suzuki, E Fujiwara, A Kobayashi

    ORGANIC CONDUCTORS, SUPERCONDUCTORS AND MAGNETS: FROM SYNTHESIS TO MOLECULAR ELECTRONICS   139   81 - +   2004( ISSN:1568-2609

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  • BETS-based molecular conductors with tetrahedral anions TlCl4-, MnBr42-, CoCl42- (BETS = bis(ethylenedithio)tetraselenafulvalene) Reviewed

    V. V. Gritsenko, E. Fujiwara, H. Fujiwara, H. Tanaka, I. Tamura, H. Kobayashi, O. A. Dyachenko

    Russ. J. Coord. Chem. 雑誌 MAIK   29   773 - 779   2003.11

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  • A Novel TTP Donor Containing a PROXYL Radical for         Magnetic Molecular Conductors Reviewed

    H. Fujiwara, H.-J. Lee, H. Kobayashi, E. Fujiwara, A. Kobayashi

    Chem. Lett. 雑誌 Chemical Society of Japan   32   482 - 483   2003.06

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  • A novel TTP donor containing a PROXYL radical for magnetic molecular conductors Reviewed

    H Fujiwara, HJ Lee, H Kobayashi, E Fujiwara, A Kobayashi

    CHEMISTRY LETTERS   32 ( 6 )   482 - 483   2003.06( ISSN:0366-7022

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    A TTP donor containing a stable PROXYL radical was synthesized to develop conducting-magnetic bifunctional materials and its structure and physical properties were investigated. Furthermore its cation radical salts were prepared and revealed their conducting and magnetic properties.

    DOI: 10.1246/cl.2003.482

  • Thermal conductivity of the antiferromagnetic organic superconductor kappa-(BETS)2FeBr4 in the low-field and field-induced superconducting states Reviewed

    M. A. Tanatar, M. Suzuki, T. Ishiguro, H. Fujiwara, H. Kobayashi

    Physica C 雑誌 Elsevier Science Ltd.   388   613 - 614   2003.05

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  • Interplay of magnetism and superconductivity in BETS conductors (BETS= bis(ethylenedithio)tetraselenafulvalene Reviewed

    H. Kobayashi, B. Zhang, H. Tanaka, H. Fujiwara, T. Otsuka, E. Fujiwara and A. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   137   1157 - 1162   2003.04

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  • Synthesis, structures and physical properties of donors containing a PROXYL radical Reviewed

    H. Fujiwara, E. Fujiwara, H. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   135-136   533 - 534   2003.04

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  • Thermal conductivity of organic superconductors in oriented magnetic field Reviewed

    M. A. Tanatar, M. Suzuki, T. Ishiguro, H. Tanaka, H. Fujiwara, H. Kobayashi, T. Toito and J. Yamada

    Synth. Met. 雑誌 Elsevier Science Ltd.   137   1291 - 1293   2003.04

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  • Synthesis, structures and properties of new organic donors connecting to a TEMPO radical through a pyrrolidine ring Reviewed

    H. Fujiwara, E. Fujiwara, H. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   133-134   359 - 360   2003.03

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  • Electronic properties of BETS superconductors with magnetic anions (BETS = bis(ethylenedithio)tetraselenafulvalene) Reviewed

    H. Kobayashi, H. Tanaka, H. Fujiwara, I. Tamura, V. Gritsenko, T. Otsuka, E. Fujiwara, A. Kobayashi, M. Tokumoto, P. Cassoux

    Synth. Met. 雑誌 Elsevier Science Ltd.   133   477 - 479   2003.03

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  • Electronic properties of BETS superconductors with magnetic anions (BETS = bis(ethylenedithio)tetraselenafulvalene) Reviewed

    H Kobayashi, H Tanaka, H Fujiwara, Tamura, I, Gritsenko, V, T Otsuka, E Fujiwara, A Kobayashi, M Tokumoto, P Cassoux

    SYNTHETIC METALS   133   477 - 479   2003.03( ISSN:0379-6779

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    The physical properties of BETS (=bis(ethylenedithio)tetraselenafulvalene) conductors with tetrahalide magnetic anions and related systems were investigated. We have recently succeeded to find the superconducting transition of the crystal of kappa-type TICl4- salt coated with epoxy resin (T-c(onset) = 2.5 K). The specific heat measurements on the antiferromagnetic organic superconductor, kappa-(BETS)(2)FeCl4 was performed down to 60 mK, which gave sharp peak at 0.45 K (T-N). The peak trails a tail at T &gt; T-N, suggesting low-dimensionality of the spin system. Resistivity measurements under magnetic field of lambda-(BETS)(2)FeGa1-xCl4 (x approximate to 0.4) exhibiting superconductor-to-insulating (SC-I) transition, I-SC phase transition was observed around 4 T at T &lt; 3 K. The "low-field superconducting region" between metallic and insulating phases around zero magnetic field is connected with the "high-field superconducting region". (C) 2002 Elsevier Science B.V. All rights reserved.

  • Highly Conducting Crystals Based on Single-Component Gold Complexes with Extended-TTF Dithiolate Ligands Reviewed

    W. Suzuki, E. Fujiwara, A. Kobayashi, Y. Fujishiro, E. Nishibori, M. Takata, M. Sakata, H. Fujiwara, H. Kobayashi

    J. Am. Chem. Soc. 雑誌 American Chemical Society   125   1486 - 1487   2003.02

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  • Highly conducting crystals based on single-component gold complexes with extended-TTF dithiolate ligands Reviewed

    W Suzuki, E Fujiwara, A Kobayashi, Y Fujishiro, E Nishibori, M Takata, M Sakata, H Fujiwara, H Kobayashi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   125 ( 6 )   1486 - 1487   2003.02( ISSN:0002-7863

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    DOI: 10.1021/ja0292243

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  • Synthesis, Structures and Physical Properties of the Cation Radical Salts Based on TEMPO Radical Containing Electron Donors Reviewed

    H. Fujiwara, E. Fujiwara and H. Kobayashi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor   380   269 - 275   2002.12

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  • New Organic Conductors Based on Tellurium-containing Donor Molecules Reviewed

    E. Ojima, H. Fujiwara, H. Kobayashi, M. Tokumoto and A. Kobayashi

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor   380   175 - 181   2002.12

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  • Antiferromagnetic Organic Superconductors, k-(BETS)2FeX4 (X = Br, Cl) Reviewed

    H. Kobayashi, E. Ojima, H. Fujiwara, H. Tanaka, T. Otsuka, A. Kobayashi, M. Tokumoto and P. Cassoux

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor   380   139 - 144   2002.12

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  • Magnetic Organic Superconductors Based on BETS Molecules_Interplay of Conductivity and Magnetism Reviewed

    H. Kobayashi, E. Fujiwara, H. Fujiwara, H. Tanaka, I. Tamura, B. Zhang, V. Gritsenko, T. Otsuka, A. Kobayashi, M. Tokumoto, P. Cassoux

    Mol. Cryst. Liq. Cryst. 雑誌 Taylor   379   2002.11

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  • Novel p-Electron Donors for Magnetic Conductors Containing a PROXYL Radical Reviewed

    H. Fujiwara, E. Fujiwara, H. Kobayashi

    Chem. Lett. 雑誌 Chemical Society of Japan   1048 - 1049   2002.10

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  • A Series of Organic Conductors k-(BETS)2FeBrxCl4-x (0 _ x _ 4) Exhibiting Successive Anti-ferromagnetic and Superconducting Transitions Reviewed

    E. Fujiwara, H. Fujiwara, H. Kobayashi, T. Otsuka, A. Kobayashi

    Adv. Mater. 雑誌 Wiley-VCH   14   1376 - 1379   2002.10

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  • A series of organic conductors, kappa-(BETS)(2)FeBrxCl4-x, (0 &lt;= x &lt;= 4), exhibiting successive antiferromagnetic and superconducting transitions Reviewed

    E Fujiwara, H Fujiwara, H Kobayashi, T Otsuka, A Kobayashi

    ADVANCED MATERIALS   14 ( 19 )   1376 - 1379   2002.10( ISSN:0935-9648

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  • Novel pi-electron donors for magnetic conductors containing a PROXYL radical Reviewed

    H Fujiwara, E Fujiwara, H Kobayashi

    CHEMISTRY LETTERS   ( 10 )   1048 - 1049   2002.10( ISSN:0366-7022

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    Synthesis, structure and physical properties of novel pi-electron donors containing a TTF moiety and a PROXYL radical within a single molecule designed for the development of magnetic conductors are reported. We also clarified the physical proper-ties of the iodine complex of the ethylenedithio derivative.

    DOI: 10.1246/cl.2002.1048

  • Dual-action molecular superconductors with magnetic anions.

    Zhang B, Tanaka H, Fujiwara H, Kobayashi H, Fujiwara E, Kobayashi A

    Journal of the American Chemical Society   124 ( 34 )   9982 - 3   2002.08( ISSN:0002-7863

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  • Dual-Action Molecular Superconductors with Magnetic Anions Reviewed

    B. Zhang, H. Tanaka, H. Fujiwara, H. Kobayashi, E. Fujiwara, A. Kobayashi

    J. Am. Chem. Soc. 雑誌 American Chemical Society   124   9982 - 9983   2002.08

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  • Dual-action molecular superconductors with magnetic anions Reviewed

    B Zhang, H Tanaka, H Fujiwara, H Kobayashi, E Fujiwara, A Kobayashi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   124 ( 34 )   9982 - 9983   2002.08( ISSN:0002-7863

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    DOI: 10.1021/ja02911l

  • Development and physical properties of magnetic organic superconductors based on BETS molecules [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H. Kobayashi, E. Fujiwara, H. Fujiwara, H. Tanaka, H. Akutsu, I. Tamura, T. Otsuka, A. Kobayashi, M. Tokumoto, P. Cassoux

    J. Phys. Chem. Solids 雑誌 Elsevier Science Ltd.   63   1235 - 1238   2002.06

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  • Magnetic molecular conductors based on BETS molecules and divalent magnetic anions [BETS = bis(ethylenedithio)tetraselenafulvalene Reviewed

    E. Fujiwara, V. Gritsenko, H. Fujiwara, I. Tamura, H. Kobayashi, M. Tokumoto, A. Kobayashi

    Inorg. Chem. 雑誌 American Chemical Society   41   3230 - 3238   2002.06

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  • An indication of magnetic-field-induced superconductivity in a bifunctional layered organic conductor, k-(BETS)2FeBr4 Reviewed

    H. Fujiwara, H. Kobayashi, E. Fujiwara, A. Kobayashi

    J. Am. Chem. Soc. 雑誌 American Chemical Society   124   6816 - 6817   2002.06

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  • An indication of magnetic-field-induced superconductivity in a bifunctional layered organic conductor, kappa-(BETS)(2)FeBr4 Reviewed

    H Fujiwara, H Kobayashi, E Fujiwara, A Kobayashi

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   124 ( 24 )   6816 - 6817   2002.06( ISSN:0002-7863

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    DOI: 10.1021/ja026067z

    PubMed

  • Magnetic molecular conductors based on BETS molecules and divalent magnetic anions [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    E Fujiwara, Gritsenko, V, H Fujiwara, Tamura, I, H Kobayashi, M Tokumoto, A Kobayashi

    INORGANIC CHEMISTRY   41 ( 12 )   3230 - 3238   2002.06( ISSN:0020-1669

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    Several conducting salts based on BETS [where BETS = bis(ethylenedithio)tetraselenafulvalene] molecules and divalent magnetic anions such as the (CoCl4)(2-), (CoBr4)(2-), and (MnBr4)(2-) were prepared. Electrocrystallization by using the (CoCl4)(2-) anion gave two kinds of crystals. Block-shaped crystals were cleared to be (BETS)(2)CoCl4, which is an insulator with the high-spin state of cobalt 3d spin. On the other hand, the X-ray crystal structure analysis of a plate-shaped crystal of the (CoCl4)(2-) salt revealed the system to be kappa-(BETS)(4)CoCl4(EtOH), which is metallic down to 0.7 K. The electronic band structure calculation gave a typical two-dimensional cylindrical Fermi surface. However, there is only very weak antiferromagnetic interaction between the S = (3)/(2) cobalt 3d spins because of its anion-solvent-intermingled layer structure. On the other hand, the electrocrystallization by using the (MnBr4)(2-) anion yielded the plate-shaped black crystals of the (MnBr4)(2-) salt. Crystal structure analysis of the (MnBr4)(2-) salt showed that the salt is theta-(BETS)(4)MnBr4(EtOH)(2) with alternating donor and anion-solvent mixed layers. The stacking direction in one donor layer is perpendicular to those of the neighboring layers. The electrical and magnetic properties of the theta-(BETS)(4)MnBr4(EtOH)(2) salt showed the metallic behavior down to similar to30 K and the paramagnetism of the high-spin manganese 3d spins. Band structure calculation of this salt gave an elliptical cylindrical Fermi surface. Because the Fermi surfaces of the adjacent donor layers are rotated to each other by 90degrees, the theta-(BETS)(4)MnBr4(EtOH)(2) salt becomes a two-dimensionally isotropic metal.

    DOI: 10.1021/ic011160u

    PubMed

  • Stable molecular metals based on bis(ethylenedithio)tetraselenafulvalene and halogen ions: k-(BETS)2X・C2H4(OH)2 (X=Br, Cl) Reviewed

    V. Gritsenko, E. Fujiwara, H. Fujiwara, H. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   128   273 - 278   2002.04

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  • Organic antiferromagnetic metals exhibiting superconducting transitions k-(BETS)2FeX4 (X=Cl, Br): drastic effect of halogen substitution on the successive phase transitions Reviewed

    T. Otsuka, A. Kobayashi, Y. Miyamoto, J. Kiuchi, S. Nakamura, N. Wada, E. Fujiwara, H. Fujiwara and H. Kobayashi

    J. Solid State Chem. 雑誌 Academic Press   159   407 - 412   2001.07

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  • Coexistence of antiferromagnetic order and superconductivity in organic conductors Reviewed

    H. Kobayashi, H. Tanaka, E. Ojima, H. Fujiwara, T. Otsuka, A. Kobayashi, M. Tokumoto. P. Cassoux

    Polyhedron 雑誌 Elsevier Science Ltd.   20   1587 - 1592   2001.05

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  • Two-dimensional Fermi surface for the organic conductor k-(BETS)2FeBr4 Reviewed

    S. Uji, H. Shinagawa, Y. Terai, T. Yakabe, C. Terakura, T. Terashima, L. Balicas, J. S. Brooks, E. Ojima, H. Fujiwara, H. Kobayashi, A. Kobayashi, M. Tokumoto

    Physica B 雑誌 Elsevier Science Ltd.   298   557 - 561   2001.04

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  • Two-dimensional Fermi surface for the organic conductor kappa-(BETS)(2)FeBr4 Reviewed

    S Uji, H Shinagawa, Y Terai, T Yakabe, C Terakura, T Terashima, L Balicas, JS Brooks, E Ojima, H Fujiwara, H Kobayashi, A Kobayashi, M Tokumoto

    PHYSICA B   298 ( 1-4 )   557 - 561   2001.04( ISSN:0921-4526

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    Magnetoresistance measurements have been performed for the organic conductor kappa-(BETS)(2) FeBr4 to investigate the Fermi surface. Three fundamental Shubnikov-de Haas oscillations (alpha, beta and gamma) were observed. The cross-sectional areas corresponding to the cc and P oscillations are about 20% and 100% in the first Brillouin zone, respectively. The oscillations can be assigned to the closed orbit and the magnetic breakdown orbit. The effective masses of the conduction electrons are determined to be 5.2m(0), for alpha and 7.9m(0) for beta. The heavy masses are probably due to the antiferromagnetic fluctuation effect of the Fe spins. The origin of the oscillation gamma with very low frequency is not explained by the band calculation. (C) 2001 Elsevier Science B.V. All rights reserved.

  • Synthesis and properties of a new TSeF derivative containing a pyrazino-ring Reviewed

    E. Ojima, H. Fujiwara, H. Kobayashi and M. Tokumoto

    Synth. Met. 雑誌 Elsevier Science Ltd.   120   887 - 888   2001.03

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  • Antiferromagnetism and Superconductivity of BETS Conductors with Fe3+ Ions Reviewed

    H. Kobayashi, H. Tanaka, E. Ojima, H. Fujiwara, Y. Nakazawa, T. Otsuka, A. Kobayashi and P. Cassoux

    Synth. Met. 雑誌 Elsevier Science Ltd.   120   663 - 666   2001.03

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  • Synthesis and properties of a new organic donor containing a TEMPO radical Reviewed

    H. Fujiwara, E. Ojima and H. Kobayashi

    Synth. Met. 雑誌 Elsevier Science Ltd.   120   971 - 972   2001.03

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  • A novel antiferromagnetic organic superconductor k-(BETS)2FeBr4 [where BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H. Fujiwara, E. Fujiwara, Y. Nakazawa, B. Z. Narymbetov, K. Kato, H. Kobayashi, A. Kobayashi, M. Tokumoto and P. Cassoux

    J. Am. Chem. Soc. 雑誌 American Chemical Society   123   306 - 314   2001.01

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  • A novel antiferromagnetic organic superconductor kappa-(BETS)(2)FeBr4 [where BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H Fujiwara, E Fujiwara, Y Nakazawa, BZ Narymbetov, K Kato, H Kobayashi, A Kobayashi, M Tokumoto, P Cassoux

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   123 ( 2 )   306 - 314   2001.01( ISSN:0002-7863

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    The electrical and magnetic properties of kappa-(BETS)(2)FeBr4 salt [where BETS = bis(ethylenedithio)tetraselenafulvalene] showed that this system is the first antiferromagnetic organic metal at ambient pressure (T-N = 2.5 K). The characteristic field dependence of the magnetization at 2.0 K indicates a clear metamagnetic behavior. The small resistivity drop observed at T-N clearly shows the existence of the interaction between pi metal electrons and localized magnetic moments of Fe3+ ions. In addition, this system underwent a superconducting transition at 1.1 K. That is, kappa-(BETS)(2)FeBr4 is the first antiferromagnetic organic metal exhibiting a superconducting transition below Neel temperature. The magnetic field dependence of the superconducting critical temperature indicated that the superconductivity in this system is strongly anisotropic also in the conduction plane because of the existence of the metamagnetically induced internal field based on the antiferromagnetic ordering of the Fe3+ 3d spins in contrast to the cases of the other conventional organic superconductors. Furthermore, the specific heat measurement exhibited a lambda -type large peak of zero-field specific heat corresponding to the three-dimensional antiferromagnetic ordering of high-spin Fe3+ ions. The lack of distinct anomaly in the C-p vs T curve at T-c suggests the coexistence of the superconductivity and the antiferromagnetic order below T-c.

  • Shubnikov-de Haas effect and Yamaji oscillations in the antiferromagnetically ordered organic superconductor k-(BETS)2FeBr4: a fermiology study Reviewed

    L. Balicas, J. S. Brooks, K. Storr, D. Graf, S. Uji, H. Shinagawa, E. Ojima, H. Fujiwara, H. Kobayashi, A. Kobayashi and M. Tokumoto

    Solid State Commun. 雑誌 Elsevier Science Ltd.   116   557 - 562   2000.11

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  • Successive antiferromagnetic and superconducting transitions in an organic metal, k-(BETS)2FeCl4 Reviewed

    T. Otsuka, A. Kobayashi, Y. Miyamoto, J. Kiuchi, N. Wada, E. Ojima, H. Fujiwara and H. Kobayashi

    Chem. Lett. 雑誌 Chemical Society of Japan   732 - 733   2000.07

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  • Preparation, structures and physical properties of selenium analogues of DTEDT as promising donors for organic metals Reviewed

    H. Fujiwara, Y. Misaki, T. Yamabe, T. Mori, H. Mori and S. Tanaka

    J. Mater. Chem. 雑誌 American Chemical Society   10   1565 - 1571   2000.07

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  • Successive antiferromagnetic and superconducting transitions in an organic metal, kappa-(BETS)(2)FeCl4 Reviewed

    T Otsuka, A Kobayashi, Y Miyamoto, J Kiuchi, N Wada, E Ojima, H Fujiwara, H Kobayashi

    CHEMISTRY LETTERS   ( 7 )   732 - 733   2000.07( ISSN:0366-7022

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    The ac magnetic measurements on an organic metal, kappa- (BETS)(2)FeCl4 down to 60 mK revealed successive antiferromagnetic and superconducting phase transitions at about 0.65 K (approximate to T-N) and 0.1 K (approximate to T-C), respectively. These transitions correspond to the similar transitions in the Br-analogue, kappa-(BETS)(2)FeBr4 but the transition temperatures of FeCl4 system are significantly lower than those of FeBr4 system (T-N = 2.5 K; T-C = 1.1 K).

  • A new k-type organic superconductor based on BETS molecules, k-(BETS)2GaBr4 [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H. Tanaka, E. Ojima, H. Fujiwara, Y. Nakazawa, H. Kobayashi and A. Kobayashi

    J. Mater. Chem. 雑誌 American Chemical Society   10   245 - 247   2000.02

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  • A new kappa-type organic superconductor based on BETS molecules, kappa-(BETS)(2)GaBr4 [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H Tanaka, E Ojima, H Fujiwara, Y Nakazawa, H Kobayashi, A Kobayashi

    JOURNAL OF MATERIALS CHEMISTRY   10 ( 2 )   245 - 247   2000.02( ISSN:0959-9428

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    Similar to the recently discovered organic conductor kappa-(BETS)(2)FeBr4 exhibiting a transition from an antiferromagnetic metal phase to a superconducting phase at 1.0K, kappa-(BETS)(2)GaBr4 shows a super-conducting transition around 0.5-1.0K, indicating T-C of kappa-(BETS)(2)MBr4 (M = Fe, Ga) to be almost independent of the existence of magnetic anions; from these findings a way to develop novel organic conductors with controlled antiferromagnetic interactions is suggested.

    DOI: 10.1039/a908789c

  • Shubnikov-de Haas effect and Yamaji oscillations in the antiferromagnetically ordered organic superconductor kappa-(BETS)(2)FeBr4: a fermiology study Reviewed

    L Balicas, JS Brooks, K Storr, D Graf, S Uji, H Shinagawa, E Ojima, H Fujiwara, H Kobayashi, A Kobayashi, M Tokumoto

    SOLID STATE COMMUNICATIONS   116 ( 10 )   557 - 562   2000( ISSN:0038-1098

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    Shubnikov-de Haas (SdH) effect and angular dependent magnetoresistance oscillations (AMRO) were observed in the organic superconductor: kappa-(BETS)(2)FeBr4. In contrast to its isostructural compound kappa-(BETS)(2)FeCl4, SdH oscillations, for fields perpendicular to the conducting planes, reveal three Fermi Surface (FS) closed orbits alpha, beta, and gamma whose cross-sectional areas are 19.8, 99.9, and 2.4% of the first Brillouin zone, respectively. The conduction electron effective masses were found to be: mu (alpha) = (4.7 +/- 0.2)m(e), mu (beta) = (8.0 +/- 1.0)m(e), and mu (gamma) = (2.0 +/- 0.2)m(e). The observation of a gamma orbit is not expected from band structure calculations, mu (beta) is among the heaviest masses ever reported for an organic conductor. The observed Yamaji-like AMRO indicates a 2D closed FS, warped along the k(z) direction. (C) 2000 Elsevier Science Ltd. All rights reserved.

  • Preparation, structures and physical properties of selenium analogues of DTEDT as promising donors for organic metals Reviewed

    H Fujiwara, Y Misaki, T Yamabe, T Mori, H Mori, S Tanaka

    JOURNAL OF MATERIALS CHEMISTRY   10 ( 7 )   1565 - 1571   2000( ISSN:0959-9428

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    Three selenium analogues of DTEDT [2-(1,3-dithiol-2-ylidene)-5-[2-(1,3-dithiol-2-ylidene)ethylidene]-1,3,4,6-tetrathiapentalene] have been synthesized. They showed four pairs of single-electron redox waves. The E-1 values are a little higher by 0.02-0.05 V than that of DTEDT. On the other hand, the E-2-E-1 values are almost equal to that of DTEDT. Their TCNQ complex and cation radical salts show fairly high electrical conductivities and several salts exhibit metallic conductivities. In particular the ReO4- and Au(CN)(2)(-) salts of DTEDS and the SbF6-, TaF6- and I-3(-) salts of DSEDS exhibited stable metallic behaviour down to 1.5-4.2 K. An X-ray crystal structure analysis of the metallic salt (DSEDS)(3)TaF6 reveals that this salt has a two-dimensional beta-type packing motif of the donor molecules similar to the superconducting (DTEDT)(3)Au(CN)(2). The calculated Fermi surface of (DSEDS)(3)TaF6 is a two-dimensional closed ellipsoid.

    DOI: 10.1039/b002790l

  • New p-extended organic donor containing a stable TEMPO radical as a candidate for conducting magnetic multifunctional materials Reviewed

    H. Fujiwara, and H. Kobayashi

    Chem. Commun. 雑誌 Royal Society of Chemistry   2417 - 2418   1999.12

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  • Synthesis, structures, and properties of new organic conductors based on tellurocycle-fused TTF donor molecules Reviewed

    E. Ojima, H. Fujiwara, H. Kobayashi and A. Kobayashi

    Adv. Mater. 雑誌 Wiley-VCH   11   1527 - 1530   1999.12

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  • Pressure-induced superconducting transition of l- (BETS)2FeCl4 with p-d coupled antiferromagnetic insulating ground state at ambient pressure [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H. Tanaka, T. Adachi, E. Ojima, H. Fujiwara, K. Kato, H. Kobayashi, A. Kobayashi and P. Cassoux

    J. Am. Chem. Soc. 雑誌 American Chemical Society   121   11243 - 11244   1999.12

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  • Pressure-induced superconducting transition of lambda-(BETS)(2)FeCl4 with pi-d coupled antiferromagnetic insulating ground state at ambient pressure [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    H Tanaka, T Adachi, E Ojima, H Fujiwara, K Kato, H Kobayashi, A Kobayashi, P Cassoux

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   121 ( 48 )   11243 - 11244   1999.12( ISSN:0002-7863

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  • Novel oxygen-containing p-electron donors for organic metals: 2-(1,3-dithiol-2-ylidene)-5-(pyran-4-ylidene)-1,3,4,6-tetrathiapentalenes Reviewed

    Y. Misaki, H. Fujiwara, T. Maruyama, M. Taniguchi, T. Yamabe, M. Takehiko, M. Mori and S. Tanaka

    Chem. Mater. 雑誌 American Chemical Society   11   2360 - 2368   1999.09

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  • Novel oxygen-containing pi-electron donors for organic metals: 2-(1,3-dithiol-2-ylidene)-5-(pyran-4-ylidene)-1,3,4,6-tetrathiapentalenes Reviewed

    Y Misaki, H Fujiwara, T Maruyama, M Taniguchi, T Yamabe, M Takehiko, M Mori, S Tanaka

    CHEMISTRY OF MATERIALS   11 ( 9 )   2360 - 2368   1999.09( ISSN:0897-4756

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    A bis-fused pi-electron donor incorporating a pyran-4-ylidene moiety, 2-(1,3-dithiol-2-ylidene)-5-(pyran-4-ylidene)-1,3,4,6-tetrathiapentalene (PDT-TTP, 1a), and its derivatives (1b-d) have been synthesized. The cyclic voltammograms of PDT-TTPs are composed of three pairs of redox waves. Comparison of the first oxidation potentials (E-1) suggests PDT-TTP (+0.42 V vs SCE in benzonitrile) is a weaker donor than TTF (+0.35 V). The present donors have produced a large number of highly conducting (sigma(rt) = 10(0)- 10(2) S cm(-1)) molecular complexes. Among them, conducting salts based on the ET-PDT (1d) are metallic down to liquid helium temperature, The metallic PF6- salt of ET-PDT has a composition of(ET-PDT)(4)PF6(cn), where cn is 1-chloronaphthalene, in which two crystallographically independent ET-PDT molecules A and B form a face-to-face stack with a four-folded period as A'ABB'. In the present salt, the head-to-tail overlap of the unsymmetrical pi-electron framework of PDT-TTP prevents an effective intrastack overlap and produces a strongly dimerized electronic structure along the stack direction. Tight-binding band calculations indicate that it has opened Fermi surfaces characteristic of quasi-one-dimensional metals.

    DOI: 10.1021/cm981035p

  • New stable metallic salt based on a donor molecule containing peri-ditellurium bridges, TMTTeN(SCN)0.88 Reviewed

    E. Ojima, B. Z. Narymbetov, H. Fujiwara, H. Kobayashi, A. Kobayashi, K. Takimiya, T. Otsubo and F. Ogura

    Chem. Lett. 雑誌 Chemical Society of Japan   845 - 846   1999.08

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  • New stable metallic salt based on a donor molecule containing peri-ditellurium bridges, TMTTeN(SCN)(0.88) Reviewed

    E Ojima, BZ Narymbetov, H Fujiwara, H Kobayashi, A Kobayashi, K Takimiya, T Otsubo, F Ogura

    CHEMISTRY LETTERS   ( 8 )   845 - 846   1999.08( ISSN:0366-7022

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    A new stable organic metal, TMTTeN(SCN)(0.88), where TMTTeN is 2,3,6,7-tetramethylnaphtho[1,8-cd:4,5-c'd']bis[1,2] ditellurole, was obtained. The donors are stacked to form columns and three-dimensional network is developed through Te ... Te contacts. The salt is highly conductive and keeps metallic behavior down to 4.2 K. Furthermore the salt exhibits Pauli paramagnetic behavior down to 2 K. The extended Huckel tight-binding band calculation was examined.

    DOI: 10.1246/cl.1999.845

  • Synthesis, structure, and physical properties of 4,5-ethylenedithio-4,5-pentathiotetrathiafulvalene and its perchlorate salt Reviewed

    E. Ojima, H. Fujiwara and H. Kobayashi

    Adv. Mater. 雑誌 Wiley-VCH   11   758 - 761   1999.07

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    Kind of work:Joint Work  

  • Antiferromagnetic organic metal exhibiting superconducting transition, k-(BETS)2FeBr4 [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    E. Ojima, H. Fujiwara, K. Kato, H. Kobayashi, H. Tanaka, A. Kobayashi, M. Tokumoto and P. Cassoux

    J. Am. Chem. Soc. 雑誌 American Chemical Society   121   5581 - 5582   1999.06

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  • Antiferromagnetic organic metal exhibiting superconducting transition, kappa-(BETS)(2)FeBr4 [BETS = bis(ethylenedithio)tetraselenafulvalene] Reviewed

    E Ojima, H Fujiwara, K Kato, H Kobayashi, H Tanaka, A Kobayashi, M Tokumoto, P Cassoux

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   121 ( 23 )   5581 - 5582   1999.06( ISSN:0002-7863

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  • Synthesis, structure and properties of an unsymmetrical tetraselenafulvalene donor fused with a pyrazino-ring (PEDTTSeF), and its cation radical salts. Reviewed

    E. Ojima, H. Fujiwara and H. Kobayashi

    Adv. Mater. 雑誌 Wiley-VCH   11   459 - 462   1999.04

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  • New pi-extended organic donor containing a stable TEMPO radical as a candidate for conducting magnetic multifunctional materials Reviewed

    H Fujiwara, H Kobayashi

    CHEMICAL COMMUNICATIONS   ( 23 )   2417 - 2418   1999( ISSN:1359-7345

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    A novel organic electron donor containing a stable TEMPO radical (TEMPOET) was synthesized and its magnetic and electrochemical properties were investigated; furthermore, the crystal structure and physical properties of the Au(CN)(2)(-) salt of TEMPOET were clarified.

    DOI: 10.1039/a907363i

  • Preparation, structures and physical properties of kappa-type two-dimensional conductors based on unsymmetrical extended tetrathiafulvalene: 2-cyclopentanylidene-1,3-dithiolo[4,5-d]-4,5-ethylenedithiotetrathiafulvalene (CPDTET) Reviewed

    H Fujiwara, Y Misaki, M Taniguchi, T Yamabe, T Kawamoto, T Mori, H Mori, S Tanaka

    JOURNAL OF MATERIALS CHEMISTRY   8 ( 8 )   1711 - 1717   1998.08( ISSN:0959-9428

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    Several cation radical salts of an unsymmetrical donor, 2-cyclopentanylidene-1,3-dithiolo [4,5-d]-4',5'-ethylenedithiotetrathiafulvalene (CPDTET) have been prepared. Most salts with octahedral (AsF6-, SbF6-, NbF6- and TaF6-) and linear (I-3(-)) anions showed high conductivity (sigma(rt) = 10(0)-10(2) S cm(-1)) and metallic conductive behaviour around room temperature. Among them, the AsF6- salt displayed metallic temperature dependence down to 4.2 K, while the SbF6- and TaF6- salts exhibited metal-to-semiconductor transitions at 200 and 140 K, respectively. The AsF6- and SbF6- salts have a kappa-type donor arrangement in which two donor molecules are strongly dimerized in a 'head-to-head' manner. The calculated Fermi surfaces of these salts are two-dimensional folded circles. Measurement of the thermoelectric power suggests that the AsF6- salt is a normal metal, however, the SbF6- salt has an almost half-filled band structure at room temperature and a small energy gap opens at low temperature. The measurements of magnetic susceptibility indicate that these two salts exhibited Pauli-paramagnetic temperature independence characteristic of metallic materials, though they also showed weak antiferromagnetic interaction. The differences between AsF6- and SbF6- salts are also discussed and the origin of the metal-to-semiconductor transition is clarified.

    DOI: 10.1039/a801375f

  • Novel stable metallic salts based on a donor molecule containing peri-ditellurium bridges, TMTTeN Reviewed

    E Arai, H Fujiwara, H Kobayashi, A Kobayashi, K Takimiya, T Otsubo, F Ogura

    INORGANIC CHEMISTRY   37 ( 12 )   2850 - 2851   1998.06( ISSN:0020-1669

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    The first stable organic metals of the peri-ditellurium-bridged polyacene donor TMTTeN were obtained as TMTTeN2M(CN)(2) (M = Ag, Au). Crystal structure analyses revealed three-dimensional networks through intermolecular Te ... Te contacts. The salts are highly conductive (500-1000 S cm(-1)) and keep the metallic states down to low temperature. The extended Huckel tight-binding band calculation gave the quasi-three-dimensional Fermi surfaces.

    DOI: 10.1021/ic9802247

  • Synthesis, structure and properties of a novel trisulfide double-bridged TTF dimer Reviewed

    H Fujiwara, E Arai, H Kobayashi

    JOURNAL OF MATERIALS CHEMISTRY   8 ( 4 )   829 - 831   1998.04( ISSN:0959-9428

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    Publishing type:Research paper (scientific journal)  

    We have synthesized novel trisulfide-bridged tetrathiafulvalene (TTF) dimer molecule in which two TTF moieties are connected to each other by two trisulfide chains. X-Ray crystal structure analysis reveals that the molecule has a unique cyclophane-like U-shape structure. The structure of the ClO4, salt is also described.

    DOI: 10.1039/a800202i

  • Synthesis, structure and physical properties of the new selenium containing metal complex NBu4[Ni(ddds)(2)] (ddds=5,6-dihydro-1,4-dithiin-2,3-diselenolate) Reviewed

    H Fujiwara, E Arai, H Kobayashi

    CHEMICAL COMMUNICATIONS   ( 9 )   837 - 838   1997.05( ISSN:1359-7345

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    The synthesis, structure and physical properties of the new selenium containing metal complex NBu4[Ni(ddds)(2)] (ddds = 5,6-dihydro-1,4-dithiin-2,3-diselenolate) are described.

    DOI: 10.1039/a701113j

  • Novel bis-fused pi-electron donors for organic metals: 2-(1,3-dithiol-2-ylidene)-5-(thiopyran-4-ylidene)-1,3,4,6-tetrathiapentalene Reviewed

    Y Misaki, H Fujiwara, T Yamabe

    JOURNAL OF ORGANIC CHEMISTRY   61 ( 11 )   3650 - 3656   1996.05( ISSN:0022-3263

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    Bis-fused pi-electron donors composed of tetrathiafulvalene (TTF) and 2-(thiopyran-4-ylidene)-1,3-dithiole (TPDT), 2-(1,3-dithiol-2-ylidene)-5-(thiopyran-4-ylidene)-1,3,4,6-tetrathiapentalene (1a, TPDT-TTP), and its derivatives (1b-d, 2a-d) have been synthesized as donor components for organic conductors. An X-ray structure analysis of bis(methylthio)-1 (1c) revealed that the TPDT-TTP skeleton is almost planar except for the outer 1,3-dithiole ring, and that the crystal has a two-dimensional ''theta-type'' arrangement of molecules. The cyclic voltammograms of TPDT-TTPs exhibit four pairs of single-electron redox waves. The first oxidation potential (E(1)) of 1a (+0.37 V vs SCE, in PhCN) is comparable to that of TTF (+0.35 V) and is higher by 0.1 V than that of TPDT (+0.27 V). The observed substituent effect on E(1) values suggests that the first one-electron oxidation mainly occurs in the 2-(thiopyran-4-ylidene)-1,3-dithiole !TPDT) moiety. On the other hand, onsite coulombic repulsion estimated from the E(2) - E(1) value is lower than in TTF and TPDT. MNDO MO calculations reveal that all the sulfur atoms in the 1,3-dithiole rings have the same phase in the HOMO, a condition necessary for realization of effective transverse intermolecular interaction. The present donors have produced many charge-transfer complexes and cation radical salts showing relatively high conductivity (sigma(rt) = 10(-1) - 10(1) S cm(-1)), several of which display metallic temperature dependence.

    DOI: 10.1021/jo9516244

    PubMed

  • Synthesis and properties of the selenium analogue of DTEDT Reviewed

    Y Misaki, H Fujiwara, T Yamabe, T Mori, H Mori, S Tanaka

    CHEMICAL COMMUNICATIONS   ( 3 )   363 - 364   1996.02( ISSN:1359-7345

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    Synthesis and electrochemical properties of the title donor are described; it gives a metallic TCNQ complex and radical-ation salts.

    DOI: 10.1039/cc9960000363

  • A VINYLOGUE OF BIS-FUSED TETRATHIAFULVALENE - NOVEL PI-ELECTRON FRAMEWORK FOR 2-DIMENSIONAL ORGANIC METALS Reviewed

    Y MISAKI, T OHTA, N HIGUCHI, H FUJIWARA, T YAMABE, T MORI, H MORI, S TANAKA

    JOURNAL OF MATERIALS CHEMISTRY   5 ( 10 )   1571 - 1579   1995.10( ISSN:0959-9428

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    Several derivatives of 2-(1,3-dithiol-2-ylidene)-5-(2-ethanediylide,3-dithiole)-1,3,4,6-tetrathiapentalene (1Aa, DTEDT), which is a vinylogue of bis-fused TTF (BDT-TTP) containing one 2,2'-ethanediylidenebis(1,3-dithiole) (2), have been synthesized. The cyclic voltammograms of the DTEDTs consist of four pairs of single-electron redox waves. Comparison of the first oxidation potentials (E(1)) reveals that donating ability of 1Aa is rather weaker than those of 2 and TTF, in spite of the extension of the apparent pi-conjugation. Substituent effects on the E(1) values suggest that the first one-electron oxidation occurs mainly in the vinylogous TTF moiety. The smaller E(2)-E(1) value of 1Aa compared with those of BDT-TTP, TTF and 2 suggests a decrease in the on-site coulombic repulsion in the dication. An X-ray structure analysis of the neutral 4,5-dimethyl-4',5'-bis(methylthio) derivatives (1Be) reveals that the crystal has a so-called 'K-type array' of molecules. An MNDO molecular orbital calculation indicates that the sulfur atoms at the termini of the vinylogous 1,3-dithiole rings are out of phase with the other sulfur atoms in the HOMO. The present donors have produced many molecular complexes exhibiting high conductivity. In particular, all of the radical-cation salts based on 1Aa obtained so far exhibit metallic conducting behaviour down to 1.4-4.2 K, regardless of the counter-anions.

    DOI: 10.1039/jm9950501571

  • Structures and conducting properties of CPTM-TTP salts Reviewed

    Y Misaki, K Kawakami, H Fujiwara, T Yamabe, T Mori, H Mori, S Tanaka

    CHEMISTRY LETTERS   ( 12 )   1125 - 1126   1995( ISSN:0366-7022

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    The title donor, CPTM-TTP (4,5-cyclopenteno-4',5'-bis(methylthio)-2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) has produced metallic cation radical salts with octahedral and linear anions. Among them, (CPTM-TTP)(4)AsF6 has a two-dimensional ''beta-type'' arrangement of donor molecules and a closed Fermi surface.

    DOI: 10.1246/cl.1995.1125

  • CRYSTAL-STRUCTURE AND PHYSICAL-PROPERTIES OF (BDT-TTP)2CLO4 Reviewed

    T MORI, Y MISAKI, H FUJIWARA, T YAMABE

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   67 ( 10 )   2685 - 2689   1994.10( ISSN:0009-2673

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    The ClO4, BF4, and ReO4 salts of BDT-TTP, 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, are isostructural, having uniform columns of the donor molecules. These salts are essentially metallic down to low temperatures, though the resistivity increases to some extent below 200 K. The thermoelectric power and ESR show simple metal-like behavior down to low temperatures.

    DOI: 10.1246/bcsj.67.2685

  • STRUCTURE AND CONDUCTING PROPERTIES OF BDT-TTP SALTS Reviewed

    Y MISAKI, H FUJIWARA, T YAMABE, T MORI, H MORI, S TANAKA

    CHEMISTRY LETTERS   ( 9 )   1653 - 1656   1994.09( ISSN:0366-7022

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    Many cation radical salts of BDT-TTP (2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) showed metallic conducting behavior down to 0.6-1.2 K. X-Ray crystal structure analysis of (BDT-TTP)(2)SbF6 revealed that this salt has a two-dimensional ''beta-type'' arrangement of donor molecules in the conducting sheet.

    DOI: 10.1246/cl.1994.1653

  • 2-(1',3'-DITHIOL-2'-YLIDENE)-5-(THIOPYRAN-4'-YLIDENE)-1,3,4,6-TETRATHIAPENTALENE - A NOVEL BIS-FUSED PI-ELECTRON DONOR Reviewed

    Y MISAKI, H FUJIWARA, T YAMABE

    JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS   ( 11 )   949 - 951   1993.06( ISSN:0022-4936

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    The synthesis and electrochemical properties of the title compound and its derivatives are described; the electrical properties of their charge-transfer complexes and cation radical salts are also presented.

    DOI: 10.1039/c39930000949

  • PREPARATION, CRYSTAL-STRUCTURE AND ELECTRICAL-PROPERTIES OF 2-CYCLOPENTANYLIDENE-1,3-DITHIOLO[4,5-D]TETRATHIAFULVALENE DERIVATIVES Reviewed

    Y MISAKI, K KAWAKAMI, H NISHIKAWA, H FUJIWARA, T YAMABE, M SHIRO

    CHEMISTRY LETTERS   ( 3 )   445 - 448   1993.03( ISSN:0366-7022

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    The title compounds (1) were prepared as the donor components for organic conductors. The molecular and crystal structures of bis(methylthio) derivative were determined by X-ray diffractional analysis. Among charge-transfer complexes and cation radical salts of 1 prepared so far, I3- salt of unsubstituted-1 and IBr2- salt of methylenedithio-1 showed metallic temperature dependence of conductivities.

  • (2-METHYLIDENE-1,3-DITHIOLO[4,5-D])TETRATHIAFULVALENE (DT-TTF) - NEW UNSYMMETRICAL TTFS CONDENSED WITH 1,3-DITHIOL-2-YLIDENE MOIETIES Reviewed

    Y MISAKI, H NISHIKAWA, H FUJIWARA, K KAWAKAMI, T YAMABE, H YAMOCHI, G SAITO

    JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS   ( 19 )   1408 - 1409   1992.10( ISSN:0022-4936

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    The synthesis and properties of the unsymmetrical tetrathiafulvalenes condensed with 1,3-dithiol-2-ylidene moieties are described; the electrical properties of several cation radical salts are also presented.

    DOI: 10.1039/c39920001408

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Books and Other Publications

  • 機能性色素の合成と応用技術

     ( Role: Joint author)

    シーエムシー出版  2007.10 

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    Responsible for pages:174-190  

  • 実験化学講座第5版第7巻

     ( Role: Joint author)

    丸善  2004.03 

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    Responsible for pages:72-88  

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  • ベンゼン縮環インドレニンからなるC2v対称スクアレン色素の結晶性薄膜の作製と近赤外光検出器への展開 Domestic conference

    濱玲史, 前田壮志, 鈴木直弥, 八木繁幸, 藤原秀紀

    日本化学会第104春季年会  2024.03 

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  • 2-フェニルキノキサリンを配位子とするイリジウム(III)錯体の近赤外りん光に及ぼすメトキシ置換基の影響 Domestic conference

    米田啓馬, 志倉瑠太, 鈴木直弥, 小玉晋太朗, 前田壮志, 八木繁幸, 藤原秀紀, 秋山誠治

    日本化学会第104春季年会  2024.03 

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  • チオフラビリウム骨格からなる中間開殻性クロコナイン色素の相転移が磁気特性に及ぼす効果 Domestic conference

    小野皓平, 岡大志, 前田壮志, 酒巻大輔, 藤原秀紀, 鈴木直弥, 小玉晋太朗, 八木繁幸

    日本化学会第104春季年会  2024.03 

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  • 共役ダイトピック配位子を有する強発光性有機白金(II)二核錯体 Domestic conference

    志倉瑠太, 工藤虹輝, 鈴木直弥, 小玉晋太朗, 前田壮志, 八木繁幸, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2023.11 

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  • ヘテロヘリセンと縮合したドナーおよびアクセプター分子の開発 Domestic conference

    堤佑貴, 難波黎旨, 酒巻大輔, 権正行, 田中一生, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2023.11 

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  • シアノ基を導入したdouble N,O-hetero[5]helicene の合成および電子的性質 Domestic conference

    神野竜樹, 酒巻大輔, 権正行, 田中一生, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2023.11 

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  • フェナジンおよびピラジノ[2,3-b]キノキサリンを電子アクセプターとするドナー-アクセプター 型近赤外蛍光色素の創出 Domestic conference

    長岡昌希, 鈴木直弥, 小玉晋太朗, 前田壮志, 酒巻大輔, 藤原秀紀, 大峰拓也, 佐伯昭紀, 八木繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type:Poster presentation  

  • 種々の複素環からなる近赤外吸収クロコナイン色素の中間開殻性 Domestic conference

    前田壮志, 岡大志, 大野友彰, 酒巻大輔, 藤原秀紀, 鈴木直弥, 八木繁幸

    2023年度色材研究発表会  2023.11 

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    Presentation type:Oral presentation (general)  

  • Intermediate Open-Shell Character of Near-Infrared Absorbing Polymethine Dyes Derived from Oxocarbons International conference

    Takeshi Maeda, Taishi Oka, Tomoaki Ohno, Daisuke Sakamaki, Hideki Fujiwara, Naoya Suzuki, Shigeyuki Yagi, Tatsuki Konishi, Kenji Kamada

    The 11th East Asia Symposium on Functional Dyes and Advanced Materials  2023.10 

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    Presentation type:Oral presentation (general)  

    Venue:Osaka  

  • Effects of Intermediate Diradical Character on cis-trans Isomerization of Near-Infrared Absorbing Squaraine Dyes International conference

    Taishi Oka, Takeshi Maeda, Naoya Suzuki, Shintaro Kodama, Daisuke Sakamaki, Hideki Fujiwara, Shigeyuki Yagi

    The 11th East Asia Symposium on Functional Dyes and Advanced Materials  2023.10 

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    Presentation type:Poster presentation  

    Venue:Osaka  

  • Synthesis and Photoluminescence Properties of Intramolecular Charge Transfer-Type Near Infrared Fluorescence Dyes Based on N-containing Heteroacenes International conference

    Masaki Nagaoka, Naoya Suzuki, Shintaro Kodama, Takeshi Maeda, Daisuke Sakamaki, Hideki Fujiwara, Takuya Oomine, Akinori Saeki, Shigeyuki Yagi

    International Symposium of the Graduate School of Engineering, Osaka Metropolitan University  2023.09 

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    Presentation type:Poster presentation  

    Venue:Osaka  

  • Effects of intermediate diradical character on cisoid-transoid isomerization of near-infrared absorbing squaraine dyes International conference

    Taishi Oka, Takeshi Maeda, Naoya Suzuki, Shintaro Kodama, Daisuke Sakamaki, Hideki Fujiwara, Shigeyuki Yagi

    International Symposium of the Graduate School of Engineering, Osaka Metropolitan University  2023.09 

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    Presentation type:Poster presentation  

    Venue:Osaka  

  • ヘテロヘリセンと縮合したドナーおよびアクセプター分子の開発 Domestic conference

    堤 佑貴・難波黎旨・酒巻大輔・権 正行・田中一生・藤原秀紀

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Poster presentation  

    Venue:岡山コンベンションセンター  

  • 含窒素ヘテロアセンを基盤とするドナー‒アクセプター型近赤外蛍光色素の合成と発光特性 Domestic conference

    長岡昌希・鈴木直弥・児玉晋太郎・前田壮志・酒巻大 輔・藤原秀紀・大峰拓也・佐伯昭紀・八木繁幸

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Poster presentation  

    Venue:岡山コンベンションセンター  

  • 2 つのジシアノメチルラジカルを導入したフェロセン誘導体の合成と動的共有結合特性 Domestic conference

    浅野琴音・酒巻大輔・藤原秀紀

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Poster presentation  

    Venue:岡山コンベンションセンター  

  • 近⾚外吸収スクアレン⾊素の中間ジラジカル性がシス−トランス異性化に及ぼす効果 Domestic conference

    岡 ⼤志・前⽥荘志・鈴⽊直 弥・⼩⽟晋太郎・酒巻⼤輔・藤 原秀紀・⼋⽊繁幸

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

  • 2-フェニルキノキサリン系配位子を有する近赤外りん光イリジウム(III)錯体の発光特性に及ぼすメチル置換基の影響 Domestic conference

    米田啓馬・志倉瑠太・鈴木直弥・小玉晋太朗・前田 壮志・八木繁幸・藤原秀紀・秋山誠治

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Poster presentation  

    Venue:岡山コンベンションセンター  

  • シアノ基を導入した double N,O-hetero[5]helicene の合成および電子的性質 Domestic conference

    神野竜樹・酒巻大輔・権 正行・田中一生・藤原秀紀

    第33回基礎有機化学討論会  2023.09 

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    Presentation type:Poster presentation  

    Venue:岡山コンベンションセンター  

  • フェニル置換カルコゲノピリリウム骨格からなるクロコナイン色素の中間開殻性評価 Domestic conference

    岡大志, 前田壮志, 酒巻大輔, 鈴木直弥, 八木繁幸, 藤原秀紀

    日本化学会第103春季年会  2023.03 

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    Presentation type:Poster presentation  

  • 近赤外吸収クロコナイン色素の複素環成分が中間開殻性に及ぼす効果 Domestic conference

    大野友彰, 岡大志, 前田壮志, 酒巻大輔, 鈴木直弥, 八木繁幸, 藤原秀紀

    日本化学会第103春季年会  2023.03 

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    Presentation type:Poster presentation  

  • 含窒素ヘテロアセン骨格を電子アクセプターとする新規分子内電荷移動型π共役化合物の創出と短波赤外発光特性 Domestic conference

    長岡昌希, 鈴木直弥, 前田壮志, 酒巻大輔, 藤原秀紀, 大峰拓也, 佐伯昭紀, 八木繁幸

    日本化学会第103春季年会  2023.03 

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    Presentation type:Oral presentation (general)  

  • 結晶化誘起二重発光特性を示す新規インドリノン誘導体 Domestic conference

    八木啓太, 鈴木直弥, 酒巻大輔, 前田壮志, 藤原秀紀, 八木繁幸

    日本化学会第103春季年会  2023.03 

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    Presentation type:Oral presentation (general)  

  • 短波赤外領域に発光を示す新規ドナー–アクセプター型色素の創出 Domestic conference

    長岡昌希, 鈴木直弥, 前田壮志, 八木繁幸, 酒巻大輔, 藤原秀紀, 大峰拓也, 佐伯昭紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2022.11 

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    Presentation type:Oral presentation (general)  

  • アルコキシ官能基化フラビリウム骨格からなる近赤外吸収クロコナイン色素の中間的な開殻性 Domestic conference

    大野友彰, 前田壮志, 酒巻大輔, 藤原秀紀, 八木繁幸

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2022.11 

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    Presentation type:Poster presentation  

  • 2-アリールキノキサリンをシクロメタル化配位子に有する近赤外りん光性イリジウム錯体の創出 Domestic conference

    志倉瑠太, 前田壮志, 鈴木直弥, 八木繁幸, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2022.11 

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    Presentation type:Poster presentation  

  • D–A型アントラキノン複合分子のクロミック挙動 Domestic conference

    早川諒, 酒巻大輔, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2022.11 

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    Presentation type:Poster presentation  

  • ピリジル基を導入したジシアノメチルラジカルの動的共有結合性および金属錯体の形成挙動 Domestic conference

    長谷川大輝, 酒巻大輔, 藤原秀紀

    分子エレクトロニックデバイス研究所&機能性有機材料開発研究センター 合同研究会  2022.11 

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    Presentation type:Poster presentation  

  • インダンジオン骨格を有するスクアレン色素の合成と有機近赤外フォトディテクターへの応用 Domestic conference

    前田壮志,田中大気,八木繁幸,藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • ジアザテトラセンが縮合した新規π拡張型TTFドナーの開発 Domestic conference

    中井美裕,西村友樹,加藤華,北所幸奈,酒巻大輔, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • ピラー状π置換基を有するフタロシアニンの会合挙動の検討 Domestic conference

    坪野洸輝, 酒巻大輔, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • ピリジル基を有するジシアノメチルラジカルの動的共有結合性および錯形成挙動 Domestic conference

    長谷川大輝, 酒巻大輔, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • 含窒素ダブルヘテロヘリセンラジカルカチオン塩の結晶構造と物性 Domestic conference

    関口日和,酒巻大輔, 鈴木修一,藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • 非対称ヘテロアセンを用いた軸性キラルD-A型分子の合成と電子的性質 Domestic conference

    石川周平, 酒巻大輔, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • メカノケミカル反応によるヘテロヘリセン及びヘテロナノグラフェンの合成法の開発 Domestic conference

    佐田帆香, 酒巻大輔, 藤原秀紀

    第32回基礎有機化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • D-A型アントラキノン複合分子のクロミック挙動 Domestic conference

    早川諒, 酒巻大輔, 藤原秀紀

    2022年光化学討論会  2022.09 

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    Presentation type:Poster presentation  

  • オキソカーボン中心骨格を持つ近赤外吸収ポリメチン色素のジラジカル特性 Domestic conference

    岡大志, 前田壮志, 酒巻大輔, 藤原秀紀, 八木繁幸, 小西龍生, 鎌田賢司

    日本化学会第102春季年会  2022.03 

  • 非対称型ヘテロアセンを用いた軸性キラル分子の合成と電子的性質 Domestic conference

    石川周平, 藤原秀紀, 酒巻大輔

    日本化学会第102春季年会  2022.03 

  • Benzo[b]phenoxazine および benzo[b]phenothiazine の酸化的二量化によるダブルヘテロヘリセンの合成と構造・電子的性質 Domestic conference

    田中駿也・田中克輝・瀧野真由・酒巻大輔・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • フラビリウム骨格とオキソカーボン酸残基からなるポリメチン色素の開殻性評価 Domestic conference

    大野友彰・岡大志・前田壮志・酒巻大輔・藤原秀紀・八木繁幸

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • 1 つまたは 2 つのジシアノメチルラジカルを導入したフェロセン誘導体の合成と動的共有結合特性 Domestic conference

    石本実里・酒巻大輔・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • 1,3-ジチオール環を置換した新規スクアライン色素の合成と物性 Domestic conference

    村田司・酒巻大輔・岡大志・前田壮志・八木繁幸・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • ジアザキノイド骨格を有する拡張型 TTF 分子の開発 Domestic conference

    溝川舜介・松田瞳・酒巻大輔・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • 配位結合部位としてのピリジル基を有する動的共有結合性ラジカルの開発 Domestic conference

    長谷川大輝・酒巻大輔・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • フェノキシラジカルを導入した拡張 TTF 誘導体の開発 Domestic conference

    服部美鈴・酒巻大輔・藤原秀紀

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • オキソカーボン酸を中心骨格に持つ近赤外吸収ポリメチン色素の中間的な開殻性 Domestic conference

    岡大志・前田壮志・酒巻大輔・藤原秀紀・八木繁幸

    第31回基礎有機化学討論会  2021.09 

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    Presentation type:Poster presentation  

  • フラビリウム骨格とオキソカーボン酸残基からなる近赤外吸収色素の合成と物性 Domestic conference

    大野 友彰、前田 壮志、酒巻 大輔、岡 大志、八木 繁幸、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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    Presentation type:Poster presentation  

  • 含窒素ヘテロテトラセンの酸化的二量化によるダブルヘテロヘリセンの合成・構造・原始的性質 Domestic conference

    田中 駿也、酒巻 大輔、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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    Presentation type:Poster presentation  

  • ジアザキノイド骨格を有する拡張型TTF分子の開発 Domestic conference

    溝川 舜介、酒巻 大輔、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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  • 1,3-ジチオール環を置換した新規スクアライン色素の合成と物性 Domestic conference

    村田 司、酒巻 大輔、岡 大志、前田 壮志、八木 繁幸、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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    Presentation type:Poster presentation  

  • ジシアノメチルラジカルを導入したフェロセン誘導体の合成と動的共有結合特性 Domestic conference

    石本 実里、酒巻 大輔、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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    Presentation type:Poster presentation  

  • フェノキシラジカルを導入した拡張TTF誘導体の開発 Domestic conference

    服部 美鈴、酒巻 大輔、藤原 秀紀

    日本化学会第101春季年会  2021.03  日本化学会

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    Presentation type:Poster presentation  

  • 異なる位置で連結したジヒドロジアザテ トラセン二量体の合成と電子的性質 Domestic conference

    田中 克輝、酒巻 大輔、藤原 秀紀

    基礎有機化学会 若手オンラインシンポジウム  2020.11  基礎有機化学会

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    Presentation type:Poster presentation  

  • 拡張キノン骨格を有する TTF の合成、構 造および動的レドックス特性 Domestic conference

    三岡 美紗稀、酒巻 大輔、藤原 秀紀

    基礎有機化学会 若手オンラインシンポジウム  2020.11  基礎有機化学会

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▼display all

Outline of collaborative research (seeds)

  • 機能性物質の物性評価

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    機能性物質の室温からヘリウム温度までの電気伝導性・磁性の評価

  • 機能性物質の構造解析

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    結晶性の機能性物質の単結晶構造解析を行う。

Charge of on-campus class subject

  • 物理化学特論A

    2023   Weekly class   Graduate school

  • 物理化学特論A

    2022   Weekly class   Graduate school

  • 機能物質化学I

    2023   Weekly class   Undergraduate

  • 分子科学実験II

    2022   Weekly class   Undergraduate

  • 化学熱力学

    2023   Weekly class   Undergraduate

  • 化学熱力学

    2022   Weekly class   Undergraduate

  • 物理化学演習I

    2023   Weekly class   Undergraduate

  • 機能物質化学I

    2022   Weekly class   Undergraduate

  • 分子科学実験II

    2023   Weekly class   Undergraduate

  • 物理化学演習I

    2022   Weekly class   Undergraduate

  • マテリアルとものづくり

    2022   Weekly class   Undergraduate

  • 研究企画ゼミナール

    2023   Intensive lecture   Graduate school

  • 分子科学課題実習

    2023   Practical Training   Undergraduate

  • 分子科学演習II

    2023   Intensive lecture   Undergraduate

  • 分子科学演習I

    2023   Intensive lecture   Undergraduate

  • 分子科学卒業研究

    2023   Practical Training   Undergraduate

  • 化学特別研究1A

    2022   Intensive lecture   Graduate school

  • 研究企画ゼミナール

    2022   Intensive lecture   Graduate school

  • 化学特別演習1A

    2022   Intensive lecture   Graduate school

  • プロポーザルディフェンス (中百舌鳥)

    2022   Intensive lecture   Graduate school

  • 化学特別演習1B (中百舌鳥)

    2022   Intensive lecture   Graduate school

  • 化学特別研究1B (中百舌鳥)

    2022   Intensive lecture   Graduate school

  • サイエンスコミュニケーションII(分子科学)

    2022     Graduate school

  • サイエンスコミュニケーションI(分子科学)

    2022     Graduate school

  • 分子科学特別研究IIB

    2022   Practical Training   Graduate school

  • 分子科学特別研究IIA

    2022   Practical Training   Graduate school

  • 分子科学特別演習II

    2022   Intensive lecture   Graduate school

  • 分子科学演習II

    2022   Intensive lecture   Undergraduate

  • 分子科学演習I

    2022   Intensive lecture   Undergraduate

  • 分子科学卒業研究

    2022   Practical Training   Undergraduate

  • 分子科学課題実習

    2022   Practical Training   Undergraduate

  • 分子科学特別研究IIA

    2021   Practical Training  

  • 分子科学特別研究IB

    2021   Practical Training  

  • 分子科学特別研究IA

    2021   Practical Training  

  • 分子科学課題実習

    2021   Practical Training  

  • 卒業研究

    2021   Practical Training  

  • Materials Chemistry I

    2021    

  • Exercises in Physical Chemistry I

    2021    

  • Physical Chemistry

    2021    

  • Chemical Thermodynamics

    2021    

  • 分子科学特別研究IIB

    2021   Practical Training  

  • Materials and Industrial Engineering

    2021    

  • 分子科学研究への招待

    2021    

  • サイエンスコミュニケーションI(分子科学)

    2021    

  • 分子科学特別演習II

    2021    

  • 分子科学特別演習I

    2021    

  • Chemistry Laboratory II

    2021   Practical Training  

  • 分子科学演習II

    2021    

  • 分子科学演習I

    2021    

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Charge of off-campus class subject

  • 分子工学特論第三(京都大学工学研究科)

    2024.01
    Institution:Kyoto University

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    Level:Postgraduate 

  • 無機化学特論A(神戸大学理学研究科)

    2020.11
    -
    2020.12
    Institution:Kobe University

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    Level:Postgraduate 

  • 無機化学特論C(神戸大学理学研究科)

    2020.11
    -
    2020.12
    Institution:Kobe University

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    Level:Postgraduate 

Social Activities

  • さくらサイエンスプランで来日した外国人大学生に対する授業

    2023.12

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    Type:Visiting lecture

  • 高校生・高専生科学技術チャレンジ(JSEC)の審査委員

    2023.04 - 2024.03

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    高校生・高専生科学技術チャレンジ(JSEC)の審査委員を担当し、高校生の研究発表に対する評価コメントを通じて、科学啓発に向けた取り組みを行った。

  • さくらサイエンスプランで来日した外国人大学生に対する授業

    2022.12

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    Type:Visiting lecture

  • 高校生・高専生科学技術チャレンジ(JSEC)の審査委員

    2022.04 - 2023.03

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    高校生・高専生科学技術チャレンジ(JSEC)の審査委員を担当し、高校生の研究発表に対する評価コメントを通じて、科学啓発に向けた取り組みを行った。

  • さくらサイエンスプランで来日した外国人大学生に対する授業

    2021.12

  • 高校生・高専生科学技術チャレンジ(JSEC)の審査委員

    2020.04 - 2022.03

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    高校生・高専生科学技術チャレンジ(JSEC)の審査委員を担当し、高校生の研究発表に対する評価コメントを通じて、科学啓発に向けた取り組みを行った。

  • さくらサイエンスプランで来日した外国人大学生に対する授業や実験指導

    2019.12

  • 堺市立堺高校 プロフェッサーズセミナー 光を使った機能性材料

    2019.04 - 2020.03

  • 大阪府立三国丘高校 実験教室 電気を通すプラスチック 〜導電性ポリマーの作製〜

    2018.04 - 2019.03

  • 大阪府立三国丘高校 三丘セミナー 光を使った機能性材料

    2018.04 - 2019.03

  • 大阪府立和泉高校 実験教室 電気を通すプラスチック 〜導電性ポリマーの作製〜

    2016.04 - 2017.03

  • 大阪府立泉北高校 大学訪問実習 電気を通すプラスチック 〜導電性ポリマーの作製〜

    2016.04 - 2017.03

  • 教員免許状更新講習 光が関係する様々な機能性材料

    2015.04 - 2016.03

  • 大阪府立泉北高校 大学訪問実習 電気を通すプラスチック 〜導電性ポリマーの作製〜

    2015.04 - 2016.03

  • 高校生のためのサイエンスフォーラム 光を使った機能性材料

    2015.04 - 2016.03

  • 大阪府立泉北高校 高大連携講座 光を使った機能性材料 〜太陽電池, ELなどの仕組み〜

    2014.04 - 2015.03

  • 大阪府立泉北高校 大学訪問実習 電気を通すプラスチック 〜導電性ポリマーの作製〜

    2012.04 - 2013.03

  • 堺市立堺高校 プロフェッサーズセミナー 光を使った機能性材料

    2012.04 - 2013.03

  • 大阪府立大手前高校 模擬授業 光を使った機能性材料 〜EL、液晶、太陽電池などの仕組み〜

    2011.04 - 2012.03

  • 大阪府立鳳高校 模擬授業 光を使った機能性材料 〜EL、液晶、太陽電池などの仕組み〜

    2011.04 - 2012.03

  • サマーサイエンスセミナー 電気を通すプラスティック ~導電性ポリマーの作製~

    2010.04 - 2011.03

  • りそなグループ技術懇親会「金属錯体の優れた機能と実用性を探る」 分子性磁性伝導体

    2010.04 - 2011.03

  • CM2セミナー 磁性と伝導性を併せ持つ分子性伝導体の開発

    2003.04 - 2004.03

  • 先端研交流会 磁性と伝導性の双機能性を有する有機伝導体の開発

    2003.04 - 2004.03

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Visiting Lectures ⇒ Link to the list of Visiting Lectures

  • 光を使った機能性材料

    Category:Science (mathematics, physics, chemistry, biology, geology, biochemistry), Engineering (machinery, electronics / physics, electrical / electronics, electrical information, chemical biotechnology, architecture, cities (civil engineering / environment), material chemistry, aerospace, marine systems, applied chemistry, chemistry, materials)

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    Audience:Junior high school students, High school students, College students, General

    Keyword:光機能性材料, 有機物 

    光を電気に変える太陽光発電や、電気から光を生み出すEL材料、光ディスクを使った記録材料、染料、色素など、世の中には光に関連した役立つもの~機能性材料~があふれています。本講義ではその仕組みについて解説します。