Transition-metal complexes of pyrrole pigments. XIX. Electrochemical and coordination behaviors of (5,10,15,20-tetraphenylporphinato)niobium(V) complexes.
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概要
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The redox chemistry of acetato(5,10,15,20-tetraphenylporphinato)oxoniobium(V) (<B>1</B>) was investigated in dichloromethane by means of cyclic voltammetry and controlled potential electrolysis. One-electron reduction potentials were observed at −0.89, −1.05, and −1.41 V <I>vs.</I> SCE for the range from 0 to −2.0 V; the reduction of niobium(V) to niobium(III) occurred prior to ligand-reduction. The potential separation between first and second metal-reductions (Δ<I>E</I><SUB>1⁄2</SUB>) for <B>1</B> is 0.16 V, while Δ<I>E</I><SUB>1⁄2</SUB> between reductions of the Mo<SUP>VI</SUP> and Mo<SUP>V</SUP> species for the corresponding molybdenum complex is 1.24 V. In order to elucidate the origin of such potential difference between the niobium and molybdenum complexes, the change of coordination structures which takes place in the course of redox reactions was examined. The coordination reaction of <B>1</B> with pyridine was also studied.
- 公益社団法人 日本化学会の論文
著者
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Murakami Yukito
Department Of Chemical Science And Technology Faculty Of Engineering Kyushu University
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Yamada Sunao
Department Of Applied Chemistry Faculty Of Engineering Kyushu University
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Matsuda Yoshihisa
Department Of Astronomy And Earth Science Tokyo Gakugei University
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Goto Takashi
Department of Applied Chemistry, Faculty of Engineering
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