Synthesis and magnetic properties of octaethylporphyrinatoiron(III) perchlorate and its mono(amine) adduct. Intermediate-spin state (S=3/2) model for ferricytochrome c'.

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概要

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• Octaethylporphyrinatoiron(III) perchlorate, its mono(pyridine) and mono(4-substituted pyridine) adducts and bis(tetrahydrofuran)octaethylporphyrinatoiron(III) perchlorate were prepared to mimic the ferricytochrome c′. Magnetic susceptibilities, M\ddot<I>o</I>ssbauer spectra, and ESR spectra have been measured. Magnetic properties in the crystalline state revealed; (i) Octaethylporphyrinatoiron(III) perchlorate, OEPFe<SUP>III</SUP>ClO<SUB>4</SUB> and bis(tetrahydrofuran)octaethylporphyrinatoiron(III) perchlorate, OEPFe<SUP>III</SUP>(THF)<SUB>2</SUB>ClO<SUB>4</SUB> are of intermediate-spin state (<I>S</I>=3/2). (ii) Magnetic susceptibilities and M\ddot<I>o</I>ssbauer parameters of mono (pyridine) and mono(4-substituted pyridine)octaethylporphyrinatoiron(III) perchlorate, OEPFe<SUP>III</SUP>(4-X-py)ClO<SUB>4</SUB> [X=CHO, X=CN, and X=H] are rather similar to those of the low-spin(<I>S</I>= 1/2) states. Absorption spectra showed that octaethylporphyrinatoiron(III) perchlorate is of intermediate-spin state in dichloromethane solution, but of high spin state in acetone solution. Close spectral resemblance of these complexes to the ferricytochrome c′ at physiological pH suggests that the latter is in intermediate-spin state.

• 公益社団法人 日本化学会の論文

著者

• SAKAI Hiroshi

  Research Reactor Institute, Kyoto University

• Watanabe Ei-ichi

  Departments Of Circulation Research Institute Of Environmental Medicine Nagoya University

• Yoshida Zen-ichi

  Department Of Applied Chemistry Faculty Of Science And Engineering Kinki University

• Maeda Yutaka

  Research Reactor Institute Kyoto University

• Sakai Hiroshi

  Research Reactor Institute Kyoto University

• Sugimoto Hiroshi

  Department Of Aeronautics And Astronautics Graduate School Of Engineering Kyoto University

• OGOSHI Hisanobu

  Department of Chemistry, Faculty of Engineering, Technical University of Nagaoka

• Ogoshi Hisanobu

  Department of Material Science, Technological University of Nagaoka

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