Electron Paramagnetic Resonance Studies of Hydrogen Bonding in Low-Spin Ferric Heme Complexes. Methoxo(N-methylimidazole)tetraphenylporphinatoiron(III) in Dimethyl Sulfoxide-Methanol and Related Systems

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概要

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• Electron paramagnetic resonance (EPR) spectroscopy has been employed to characterize the hydrogen-(H-) bonded state of the mixed-ligand low-spin complex Fe(TPP) (OMe) (NMeIm), which is formed upon mixing of Fe(TPP) (OMe) with NMeIm in Me_2SO-MeOH. Two spectrally distinct low-spin species, designated A and B in increasing order of g anisotropy, were detected depending upon the MeOH concentration in the solvent. The two low-spin species differ in degree of H-bond formation between the coordinated MeO^- and the solvent MeOH. The H-bond formation proceeds in one step, by EPR criteria, A and B being regarded as in the initial and final H-bonded states, respectively. The H-bonding interaction results in a decreased crystal field around the iron, thereby causing the tetragonal and rhombic splittings in the t_2 orbitals to decrease on going from A to B.

• 公益社団法人日本薬学会の論文
• 1986-06-25

著者

• 大矢 とし江

  Biophysics Division Faculty Of Pharmaceutical Sciences Teikyo University

• 佐藤 三男

  Faculty of Pharmaceutical Sciences, The University of Tokyo

• 大塚 知子

  Faculty of Pharmaceutical Sciences, Teikyo University

• 大矢 とし江

  Faculty of Pharmaceutical Sciences, Teikyo University

• Sato M

  Niigata Univ. Niigata

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