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Organic Radical Based Magnetic Materials with Strong Intermolecular Magnetic Interactions

Research Project

Project/Area Number 21550138
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Functional materials chemistry
Research InstitutionTokyo Metropolitan University

Principal Investigator

FUJITA Wataru  首都大学東京, 理工学研究科, 准教授 (50292719)

Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords有機ラジカル磁性体 / 磁気相転移 / 結晶構造 / 有機ラジカル / 分子磁性 / スピンギャップ / 反強磁性転移 / 二次元磁性体 / 結晶構造解析 / 磁気的性質 / 相転移 / フェリ磁性
Research Abstract

Recently acquirement of rare earth metals in industrial circles grows into a serious problem. At some future date, it will be important to develop high performance magnets without use of heavy rare elements. In fact we should consider that we make the high performance materials from abundant elements such as carbon, nitrogen, oxygen, hydrogen, sulfur, iron, etc. Then, there are organic ferromagnets as candidate for materials satisfying the above demand. Since the first organic ferromagnet, p-NPNN, was found in 1991, more than 30 organic ferromagnets with intermolecular ferromagnetic interactions have been synthesized. However, their Curie temperatures of molecule-based ferromagnets with the ferromagnetic ordered state remained low because intermolecular ferromagnetic interactions were generally weak in organic magnetic materials. In this study, a new approach to construction of molecule-based ferrimagnets which have strong antiferromagnetic interactions and which have high transition temperatures is reported. In an ionic crystal, cations and anions are usually aligned alternatively due to the Coulomb's interaction. If the spin multiplicity of the cation will be different from that of the anion, desirable molecular alignment from ferrimagnetism in ionic crystals will be obtained. We demonstrated ferrimagnetic ordering below 12. 2 K in an ionic crystal, BBDTA_2ReBr_6, consisted of an organic radical cation BBDTA^+(S=1/2) and a transition metal anion ReBr_6^<2->(S=3/2). Although the magnetic transition temperature is relatively low, compared to those of traditional molecule-based ferrimagnets, we believe that this new approach using the Coulombic interactions will be useful for the construction of ferrimagnetic materials. Combination of various magnetic cations and anions will give rise to ferrimagnets with high transition temperature. The above aspects will attract the interest of readers working in the various fields on materials science.

Report

(4 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (25 results)

All 2011 2010 2009

All Journal Article (18 results) (of which Peer Reviewed: 18 results) Presentation (7 results)

  • [Journal Article] Structural and Magnetic Studies on Two-dimensional Square Planar Lattice Magnets Composed of Organic Radical Cation Salts2011

    • Author(s)
      W. Fujita, K. Takahashi, H. Kobayashi
    • Journal Title

      Cryst, Growth Des

      Volume: 11 Pages: 575-82

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Solid state NMR strategies for the structural characterization of new hybrid materials based on the intercalation of nitroxide radicals into CdPS_32011

    • Author(s)
      W. L. Hemme, W. Fujita, K. Awaga, H. Eckert
    • Journal Title

      Solid State Nucl. Magn. Reson

      Volume: 39 Pages: 106-11

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Structural and Magnetic Studies on Two-dimensional Square Planar Lattice…2011

    • Author(s)
      W.Fujita, K.Takahashi, et al
    • Journal Title

      Crystal Growth & Design

      Volume: 11 Pages: 575-582

    • Related Report
      2011 Annual Research Report 2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Solid state NMR strategies for the structural characterization of new hybrid materials based on the intercalation of nitroxide radicals into CdPS_32011

    • Author(s)
      W.L.Hemme, W.Fujita, et al
    • Journal Title

      Solid State Nucl.Magn.Reson.

      Volume: 39 Pages: 106-115

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Uniaxial Strain Orientation Dependence of…2011

    • Author(s)
      K.Kikuchi, W.Fujita, et al
    • Journal Title

      J.Am.Chem.Soc.

      Volume: 133 Pages: 19590-19593

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal Structure and Magnetic Properties of Organic Radical Cation Salt2010

    • Author(s)
      K. Suzuki, T. Kodama, K. Kikuchi, W. Fujita
    • Journal Title

      Chem. Lett

      Volume: 39 Pages: 1096-8

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Biradical Character of Linearπ-Conjugated Oligomer Dications Composed of Thiophene2010

    • Author(s)
      K. Suzuki, T. Kodama, K. Kikuchi, W. Fujita
    • Journal Title

      Pyrrole and Methylthio End-Capping Units

      Volume: 12 Pages: 5374-7

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] スピンパイエルス物質における静水圧力・一軸性圧縮効果と自在な物性制御2010

    • Author(s)
      美藤正樹・出口博之・藤田渉・近藤隆祐・鹿児島誠一
    • Journal Title

      固体物理

      Volume: 45 Pages: 349-360

    • NAID

      40017247675

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Biradical Character of Linear π-Conjugated Oligomer Dications Composed…2010

    • Author(s)
      T.Nishinaga, W.Fujita, et al.
    • Journal Title

      Organic Letters

      Volume: 12 Pages: 5314-5377

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal Structure and Magnetic Properties of Organic Radical Cation Salt…2010

    • Author(s)
      K.Suzuki, W.Fujita, et al.
    • Journal Title

      Chemistry Letters

      Volume: 39 Pages: 1096-1099

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Magneto-structural correlations in a 1, 3, 2-dithiazolyl radical crystal, BBDTA・GaBr4 : Structure and magnetic properties of its three polymorphs2009

    • Author(s)
      W. Fujita, K. Kikuchi, Chem. Asian J
    • Journal Title

      Chem. Asian J.

      Volume: 4 Pages: 400-5

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Intercalation of stable organic radicals into layer ed saponite clay2009

    • Author(s)
      W. L. Hemme, W. Fujita, K. Awaga, H. Eckert
    • Journal Title

      Dalton Trans

      Pages: 7995-8004

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Intercalation of stable organic radicals into layered inorganic host matrices : Preparation and structural characterization of Cd_<1-x> PS_3(metaMPYNN)_<2x>2009

    • Author(s)
      W. L. Hemme, W. Fujita, K. Awaga, H. Eckert
    • Journal Title

      J. Solid State Chem

      Volume: 182 Pages: 3330-41

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Effects of hydrostatic pressure and uniaxial strain on the spin-Peierls transition in an organic radical magnet2009

    • Author(s)
      M. Mito, S. Kawagoe, H. Deguchi, S. Takagi, W. Fujita, K. Awaga, R. Kondo, S. Kagoshima
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 78

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Quantum spin state and magnetization plateaus in an S=1 Kagome Heisenberg antiferromagnet.2009

    • Author(s)
      T. Matsushita, N. Hamaguchi, K. Shimizu, N. Wada, W. Fujita, K. Awaga, A. Yamaguchi, H. Ishimoto
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 79

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Magneto-Structural Correlations in a 1, 3, 2-Dithiazolyl Radical Crystal,…2009

    • Author(s)
      W.Fujita, K.Kikuchi
    • Journal Title

      Chemistry-Asian Journal 4

      Pages: 400-405

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of hydrostatic pressure and uniaxial strain on …2009

    • Author(s)
      M.Mito, W.Fujita, et al.
    • Journal Title

      Journal of Physical Society of Japan 78

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Intercalation of stable organic radicals into…2009

    • Author(s)
      W.L.Hemme, W.Fujita, et al
    • Journal Title

      Dalton Transaction

      Pages: 7995-8004

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] 有機ラジカル結晶における分子自由度と磁気相転移2011

    • Author(s)
      藤田渉
    • Organizer
      新学術領域研究「分子自由度が拓く新物質科学」
    • Place of Presentation
      東京大学本郷キャンパス
    • Year and Date
      2011-06-08
    • Related Report
      2011 Annual Research Report
  • [Presentation] Magneto-structural Correlation in Organic Radical Cation Salts, BBDTA・X2011

    • Author(s)
      W. Fujita
    • Organizer
      MDF Workshop Open-shell Organic Molecules,-Synthesis and Electronic Structure Freedom
    • Place of Presentation
      Osaka
    • Related Report
      2011 Final Research Report
  • [Presentation] 2D Quadratic Lattice Magnets…2010

    • Author(s)
      W.Fujita, K.Kikuchi
    • Organizer
      ICSM2010
    • Place of Presentation
      京都
    • Year and Date
      2010-07-05
    • Related Report
      2010 Annual Research Report
  • [Presentation] 有機分子フェリ磁性体BBDTA_2ReBr_6の結晶構造と磁気的性質2010

    • Author(s)
      鈴木健一、兒玉健、菊地耕一、藤田渉
    • Organizer
      日本化学会第90春季年会
    • Place of Presentation
      東大阪
    • Related Report
      2011 Final Research Report
  • [Presentation] Magnetic Phase Transitions in 2D Quadratic Magnets, BBDTA・X2009

    • Author(s)
      W.Fujita, K.Kikuchi
    • Organizer
      ISCOM 2009
    • Place of Presentation
      Niseko, Hokkaido
    • Year and Date
      2009-09-13
    • Related Report
      2009 Annual Research Report
  • [Presentation] Magnetic Phase Transitions in 2D Quadratic Magnets BBDTA・X2009

    • Author(s)
      W. Fujita, K. Kikuchi
    • Organizer
      The 8th International Symposium on Crystalline Organic Metals
    • Place of Presentation
      ニセコ
    • Related Report
      2011 Final Research Report
  • [Presentation] 有機磁性分子が形成する二次元正方格子ネットワークにおける磁気相転移2009

    • Author(s)
      藤田渉、笹森幸太、菊地耕一、高橋正
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      熊本
    • Related Report
      2011 Final Research Report

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Published: 2009-04-01   Modified: 2016-04-21  

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