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DISIGN AND CONSTRUCTION OF ORGANIC FERROMAGNET AND THEIR CRYSTAL DESIGN.

Research Project

Project/Area Number 06453037
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Organic chemistry
Research InstitutionHOSEI UNIVERSITY

Principal Investigator

NAKAMURA Nobuo  HOSEI UNIV., ENGINEERING,PROFESSOR, 工学部, 教授 (40011598)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1995: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1994: ¥3,600,000 (Direct Cost: ¥3,600,000)
Keywordshexacarbene / nonacarbene / ethynyl ketone / phenylnitronyl nitroxide / naphthylnitronyl nitroxide / ferromagnetic interaction / x-ray crystallography / no-bond atomic distance / 環状ヘキサケトン / 環状オクタケトン / 環状ヘキサカルベン / ナフチルアミンN-オキシル / トリフェニレン / ポリカルベン / 有機強磁性体 / 超常磁性 / 結晶設計 / アリールエチニルケトン / トリス(アロイル)ベンゼン
Research Abstract

In order to achieve an organic ferromagnet, two approaches to it were adopted ; (i) intrarmolecular approach and (ii) intermolecular one.
(i) Previous ESR studies on branched-chain hexa-and nonacarbenes, successfully generated photochemically at a cryogenic temperature from the corresponding diazo precursors, suggested their magnetic behaviors as spin-glass or super-paramagnetic. Though large scale preparations of the carbene precursors were carried out to get further insights into the phenomenon, preliminary experiments on an AC-SQUID instrument revealed that the instrumental sensitivity was quite disappointing under an extremely dilute condition which was definitely required for the carbene not to interact antiferromagnetically.
The key step for the preparation of those carbene precursors was an amine-catalyzed cyclo-trimerization reaction of ethynyl ketones, whose mechanisms were determined by the use of substituted aryl ethynyl ketones to involve aryl 2-aminoethenyl ketones.
Cyclic he … More xacarbene which might be assumed to have a partial skeleton of an ideal polycarbene with honycomb structure was successfully generated to show that the spin quantum number S is 6 as expected theoretically. This result together with those of isomeric branched-chain hexacarbenes clearly demonstrates that the spin multiplicity of the alternant hydrocarbon molecules is determined by the topological symmetry of the pi-bond sequence.
(ii) As preliminary X-ray structural analysis on (3,5-dihydroxyphenyl) nitronyl nitroxide indicated the hydroxyl group to be effective in arranging the molecules two dimentionally, syntheses, magnetic observations, and x-ray crystallographic analyzes of several (hydroxynaphthyl) nitronyl nitroxide isomers were performed along with those of the corresponding (bromophenyl)- and (bromonaphthyl) nitronyl nitroxide radicals. It was found that some of these radicals showed ferromagnetic behaviors at extreme low temperatures. Further studies on these molecules are under way. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] K.Matsuda et al.: "Exploratory and Mechanistic Studies of the Trimerization Reaction of Benzoyl-acetylenes in the Presence of a Secondary Amine." Chem.Lett.,. 1994. 1765-1768 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Matsuda et al.: "Design,Synthesis,and Characterization of Three Kinds of π-Cross-Conjugated Hexacarbenes with High-Spin (S=6) Ground States." J.Am.Chem.Soc.,. 117. 5550-5560 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Matsuda et al.: "Design and Syntbesis of a "Starburst" -Type Nonadiazo Compound and Magnetic Characterization of Its Photoproduct." Chem.Eur.J.,. 2. 259-264 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Matsuda et al.: "Toward Dendritic Two-Dimensional Polycarbenes : Synthesis of 'Starburst' -Type Nona- and Dodecadiazo Compounds and Magnetic Study of Their Photoproducts." Bull.Chem.Soc.Jpn.,. 69. 1483-1494 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N.Nakamura et al.: "Ferromagnetic Interactions in Crystalline 3-Bromophenylnitronyl Nitroxide" (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N.Nakamura et al.: "Syntheses and Magnetic Behaviors of Substituted 1-and 2-Naphthylnitrony1 Nitroxides" (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Matsuda, Nobuo Nakamura, and Hiizu Iwamura: "Exploratory and Mechanistic Studies of the Trimerization Reaction of Benzoylacetylenes in the Presence of a Secondary Amine." Chem.Lett.1765-1768 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Matsuda, Nobuo Nakamura, Kazuyuki Takahashi, Katsuya Inoue, Noboru, Koga, and Hiizu Iwamura: "Design, Synthesis, and Characterization of Three Kinds of pi-Cross-Conjugated Hexacarbenes with High-Spin (S=6) Ground States." J.Am.Chem.Soc.117. 5550-5560 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Matsuda, Nobuo Nakamura, Katsuya Inoue, Noboru Koga, and Hiizu Iwamura: "Design and Synthesis of a "Starburst"-Type Nonadiazo Compound and Magnetic Characterization of Its Photoproduct." Chem.Eur.J.2(3). 259-264 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Matsuda, Nobuo Nakamura, Katsuya Inoue, Noboru Koga, and Hiizu Iwamura: "Toward Dendritic Two-Dimensional Polycarbenes : Syntheses of 'Starburst'-Type Nona-and Dodecadiazo Compounds and Magnetic Study of Their Photoproducts" Bull.Chem.Soc.Jpn.69. 1483-1494 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nobuo Nakamura, Yasuharu Tanabe, Katsuya Inoue, and Hiizu Iwamura: "Ferromagnetic Interactions in Crystalline 3-Bromophenylnitronyl Nitroxide." (to be published.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Nobuo Nakamura, Yasuharu Tanabe, Takayuki Ooe, Katsuya Inoue, and Hiizu Iwamura: "Syntheses and Magnetic Behaviors of Substituted 1- and 2-Naphthylnitrony1 Nitroxides." (to be published.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Matsuda, N. Nakamura, K. Takahashi,…, and H. Iwamura: "Design, Synthesis, and Characterization of Three Kinds of π-Cross-Conjugated Hexacarbenes wuth High-Spin(S=6)Ground States" J. Am. Chem. Soc.117(20). 5550-5560 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] K. Matsuda, N. Nakamura, K. Inoue, N. Koga, and H. Iwamura: "Design and Synthesis of a ‘Starburst'-Type Nonadiazo Compound and Magnetic Characterization of its Photoproduct" Chem. Eur. J.2(3). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] K.Matsuda,N.Nakamura,and H.Iwamura: "Exploratory and Mechanistic Studies of the Trimerization Reaction of Benzoylacetylenes in the Presence of a Secondary Amine" Chemistry Letters. 1994(9). 1765-1768 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Matsuda,K.Inoue,N.Koga,N.Nakamura,and H.Iwamura: "Photochemical Production of Highly Ordered Spin in Organic Solids" Molecular Crystals & Liquid Crystals. 253. 33-40 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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