An ESR Study of Monomeric Cobalt Oxygen Complexes in Solutions

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概要

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• Several mononuclear cobalt oxygen complexes in solutions have been investigated by means of ESR measurements. When a pyridine (and also substituted pyridines, <I>N</I>,<I>N</I>-dimethylformamide, dimethyl sulfoxide, and hexamethylphosphoramide) solution of a bis-salicylaldehyde-imine cobalt-(II) complex (<I>N</I>,<I>N</I>′-ethylene-bis(salicylideneiminato)cobalt(II), and <I>N</I>,<I>N</I>′-ethylene-bis(3-methoxysalicylideneiminato)cobalt(II)) was exposed to oxygen, there appeared a reversible ESR signal, in which a hf structure of eight lines caused by a mononuclear cobalt was observed. This spectrum could be analysed by considering the species to be essentially a superoxide cobalt(III). We tried to explain the deviations in the <I>A</I><SUB>Co</SUB> and the <I>g</I> values of the species from solvent to solvent by considering that the solvent coodinates to the cobalt complex in the <I>trans</I> position against the coodinated oxygen. As a comparative study, the mononuclear oxygen adduct of di(salicylal)-3,3′-diimino-di-<I>n</I>-propylamine-cobalt(II) was also studied in the above solvents.

• 公益社団法人 日本化学会の論文

著者

• Koda Seiichiro

  Department Of Chemical Engineering Facutly Of Engineering The University Of Tokyo

• Koda Seiichiro

  Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo

• Misono Akira

  Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo

• Uchida Yasuzo

  Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo

• Misono Akira

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

• Uchida Yasuzo

  Department of Industrial Chemistry, Faculty of Engineering, The University of Tokyo

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