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2008 Fiscal Year Annual Research Report

磁気異方性およびスピンカイラリティに関する理論的研究

Research Project

Project/Area Number 18350008
Research InstitutionOsaka University

Principal Investigator

山口 兆  Osaka University, 極限量子科学研究センター, 特任教授 (80029537)

Keywords軌道 / スピン / 電荷 / 近似遮蔽 / エネルギー勾配法 / ヘモシアニン / 鉄イオウ錯体 / P450
Research Abstract

本年度は化学反応における軌道、スピン、電荷、およびカイラル対称性の破れとその回復について研究を進めた。まず、電子相関効果の強い電子系を有する分子系の構造最適化法として対称性の破れた密度汎関数法(DFT)に近似スピン射影により対称性の回復を行ったエネルギー勾配法(AP-OPT)を開発し、ヘモシアニン酵素の性サイトである二核銅酸化物錯体の構造最適化に適用しその有効性を確立した。また、ヘモシアニン酵素に酸素分子が付加した酸化型錯体の化学結合指数を求め、化学結合様式を解明した。さらに、AP-OPT法を強相関電子糸の典型例であるCr-Cr4重結合の結合エネルレギーと結合距離の計算に適用し実測値を良く再現することを示した。次に、イオンラジカル種や混合原子価錯体では分子自体の空間対称性が存在するにも関わらず種々の計算法でスピンおよび電荷密度分布の対称性が破れることが知られている。しかし、これらBroken-Symmetry(BS)解の共鳴效果を考慮するResonating Broken-Symmetry(RBS)法ではこれらの対称性が回復することが示された。次に、BS法を種々の有機物のヒドロキシ化反応を触媒するP450の電子構造解析に適用し、この反応系では基底状態でも2重項から6重項まで必要に応じてスピン対称性が実際に変化し、実験結果を良く再現することが分かった。さらに、P450の酸化反応経路を解明するために、各種遷移状態構造と中間体をBS型DFTにより決定し、配置依存反応相関図を構築することに成功した。さらに、RBS法により反応の状態相関図を求め、局所的スピンクロスオーバー現象などを解明した。また、4鉄イオウ錯体では酸化還元ポテンシャルに対する水素結合効果も検討した。さらに、カイラル対称性に関与するDMパラメータの計算を実行した。

  • Research Products

    (15 results)

All 2008

All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (3 results)

  • [Journal Article] Theoretical studies on the structure and effective exchange integral (Jab) of an active site in oxyhemocyanin (oxyHc) by using approximately spin-projected geometry optimization (AP-opt) method2008

    • Author(s)
      T. Saito, Y. Kitagawa, M. Shoji, Y. Nakanishi, M. Ito, T. Kawakami, M. Okumura, K. Yamaguchi
    • Journal Title

      Chem. Phys. Lett. 456

      Pages: 76-79

    • Peer Reviewed
  • [Journal Article] BS DFT and BS HDFT studies of Cr-Cr sextuple bond from the view point of electron correlation effects2008

    • Author(s)
      Y. Kitagawa, Y. Nakanishi, T. Saito, T. Kawakami, M. Okumura, K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem., 108 (2008)2888-2895 108

      Pages: 2888-2895

    • Peer Reviewed
  • [Journal Article] DFT study for the heterojunction effect in the precious metal clusters2008

    • Author(s)
      M. Okumura, M. Kinoshita, H. Yabushita, Y. Kitagwa, T. Kawakami, K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 3010-3018

    • Peer Reviewed
  • [Journal Article] Resonating broken symmetry CI approach for ion-radical systems : comparison with UHF, hybrid-DFT and CASSCF-DFT2008

    • Author(s)
      S. Nishihara, S. Yamanaka, T. Ukai, K. Nakata, K. Kusakabe, Y. Yonezawa, H. Nakamura, T. Takada, K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 2966-2977

    • Peer Reviewed
  • [Journal Article] Extended Hartree-Fock theory of chemical reactions. VIII. Hydroxylation reactions of chemial reactions by P4502008

    • Author(s)
      H. Isobe, S. Nishihara, M. Shoji, S. Yamanaka, J. Shimada, M. Hagiwara, K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 2991-3009

    • Peer Reviewed
  • [Journal Article] Theory of chemical bonds in metalloenzymes XI. Full geometry optimization and vibration analysis of porphyrin iron-oxo species2008

    • Author(s)
      M. Shoji, H. Isobe, T. Saito, Y. Kitagawa, S. Yamanaka, T. Kawakami, M. Okumura. K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 2950-2965

    • Peer Reviewed
  • [Journal Article] Theoretical studies on effects of hydrogen bonds attaching to cysteine ligands on 4Fe-4S clusters2008

    • Author(s)
      Y. Kitagawa, M. Shoji, T. Saito, Y. Nakanishi, K. Koizumi, T. Kawakami, M. Okumura, K. Yamaguchi
    • Journal Title

      Jnt. J. Quant. Chem. 108

      Pages: 2881-2887

    • Peer Reviewed
  • [Journal Article] Theoretical Studies on Electronic Structures and Chemical Indices of the Active Site of Oxygenated and Deoxygenated Hemerythrin2008

    • Author(s)
      Y. Takano, H. Isobe, K. Yamaguchi
    • Journal Title

      Bull. Chem. Soc. Jpn. 81

      Pages: 81-102

    • Peer Reviewed
  • [Journal Article] Theoretical investigation of the magnetic interactions of Ni_9 complexes2008

    • Author(s)
      M. Shoji, Y Kitagawa, T . Kawakami, S. Yamanaka, M. Okumura, K. Yamaguchi
    • Journal Title

      J. phys. Chem A. 112

      Pages: 4020-4028

    • Peer Reviewed
  • [Journal Article] Regulation Mechanism of Spin-Orbit Coupling in Charge-Transfer-Induced Luminescence of Imidazopyrazinone Derivatives2008

    • Author(s)
      H. Isobe, S. Yamanaka, S. Kuramitsu, K. Yamaguchi
    • Journal Title

      J. Am. Chem. Soc. 130

      Pages: 132-149

    • Peer Reviewed
  • [Journal Article] N-bands Hubbard models IV. Copmparisons of electron- or hole-doped quatemary oxypictides LaOMPn superconductors with cuprates2008

    • Author(s)
      K. Yamaguchi, S. Yamanaka, H. Isobe, M. Hagihara, D. Yamaki, M. Nishihara, Y. Kitagawa, T. Kawakami, M. Okumura
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 3016-3041

    • Peer Reviewed
  • [Journal Article] Theory of Chemical Bonds in Metalloenzymes. VII. Hybrid-Density Functional Theory Studies on the Electronic Structures of P452008

    • Author(s)
      M. Shoii, H. Isobe, T. Saito, H. Yabushita, K. Koizumi, Y. Kitagawa, S. Yamanaka, T. Kawakami, M. Okumura, M. Hagiwara, K. Yamaguchi
    • Journal Title

      Int. J. Quant. Chem. 108

      Pages: 631-650

    • Peer Reviewed
  • [Presentation] Instability in Chemical Bonds -from broken-symmetry (BS)single-reference (SR) to symmetry-adapted (SA) multi-reference (MR)approaches to strongly correlated electron systems2008

    • Author(s)
      K. Yamaguchi, H. Isobe, S. Yamanaka
    • Organizer
      International Conference Computational Methods in Science and Engineering (ICCMSE)2008
    • Place of Presentation
      Greece, Crete
    • Year and Date
      2008-09-26
  • [Presentation] Instability in Chemical Bonds -from broken-symmetry (BS) single-reference (SR) to symmetry-adapted (SA) multi-reference (MR) approaches to strongly correlated electron systems2008

    • Author(s)
      K. Yamaguchi, H. Isobe, S. Yamanaka
    • Organizer
      2^<nd> Annual Meeting between Concepts in Chemistry and Quantum Chemistry
    • Place of Presentation
      Sweden, Valadalen
    • Year and Date
      2008-08-27
  • [Presentation] Theoretical Studies of Charge- Transfer Luminescence in Molecular and Biomolecular Systems2008

    • Author(s)
      K. Yamaguchi, H. Isobe, S. Yamanaka
    • Organizer
      15^<th> International Symposium on Bio luminescenceand Chemi luminescence
    • Place of Presentation
      China, Shanghai
    • Year and Date
      2008-05-13

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Published: 2010-06-11   Modified: 2016-04-21  

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