Kinetics of Multidentate Ligand Substitution Reactions. XIV. Substitution Reactions of Ethylenediaminetetraacetic Acid (EDTA) and <I>N</I>-(2-Hydroxyethyl)ethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′-triacetic Acid (EDTA-OH) with Nickel(II)-Ethylenediamin
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概要
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The kinetics of the substitution reactions of EDTA and EDTA-OH with nickel(II)-EDMA and -Dien complexes were studied using the polarographic technique. The substitution reactions of EDTA and EDTA-OH with the nickel(II)-EDMA complex were found to have a common reaction mechanism. They were first-order with respect to EDTA or EDTA-OH, and also first-order with respect to the nickel (II)-EDMA complex with a 1: 1 composition; their reaction mechanism could be formulated as: <BR>(<U>Remark: Graphics omitted.</U>)<BR>The substitution reactions of EDTA and EDTA-OH with the nickel(II)-Dien complex were also studied under experimental conditions where the reaction could be treated as a pseudo-first-order reaction. The reactions were first-order with respect to the concentration of EDTA or EDTA-OH. However, their reaction rate were independent of the concentrations of the nickel(II)-Dien complex and of uncomplexed Dien. This fact was ascribed to the formation of a stable outer-sphere complex between the nickel(II)-Dien complex with a 1: 2 ratio and the EDTA or EDTA-OH anion, through which the substitution reaction proceeds.
- 公益社団法人 日本化学会の論文
著者
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Watanabe Toshiyuki
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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Kodama Mutsuo
Department Of Chemistry College Of General Education Hirosaki University
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Hashimoto Michinori
Department of Chemistry, Ibaraki University
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