The axial-ligand replacement of the (Tetrakis(1-methyl-4-pyridinio)porphine)iron(III) ion by the cyanide ion in a highly alkaline aqueous solution.
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概要
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The axial-ligand replacement of the [Tetrakis(1-methyl-4-pyridinio)porphine]iron(III) ion by the cyanide ion was investigated in a highly alkaline aqueous solution by means of the spectrophotometric method at 25 °C. In the course of the replacement, a protolytic equilibrium between monocyanomonoaqua- and monocyanomonohydroxo complex ions was observed; the p(<I>K</I><SUB>a</SUB>/mol dm<SUP>−3</SUP> value of the monocyanomonoaqua complex ion was found to be 12.2±1.1. In the formation of the dicyano complex ion, the rate-determining step was the second replacement of axial ligands, i.e., from the monocyano complex ion to the dicyanocomplex ion; according as the pH is 11 or 13, the equilibrium constant was found to be 38.0 mol<SUP>−1</SUP> dm<SUP>3</SUP> or 11.0, while the rate constant was 1.07×10<SUP>−3</SUP> or 4.23×10<SUP>−3</SUP> mol<SUP>−3</SUP> dm<SUP>3</SUP> s<SUP>−1</SUP>.
- 公益社団法人 日本化学会の論文
著者
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Ujimoto Kikujiro
Department Of Chemistry Faculty Of Science Fukuoka University
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Kurihara Hirondo
Department Of Chemistry Faculty Of Science Fukuoka University
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Arifuku Fumihiro
Department Of Chemistry Faculty Of Science Fukuoka University
関連論文
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