Kinetics of Multidentate Ligand Substitution Reactions. XVII. Substitution Reactions of Diethylenetriaminepentaacetate (DTPA) with Aminopolycarboxylate Complexes of Nickel(II) and Cobalt(II)

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概要

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• The kinetics of the substitution reactions of DTPA with <I>N</I>-(2-hydroxyethyl)iminodiacetate (HIDA) and <I>N</I>-(2-hydroxyethyl)ethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′-triacetate (EDTA-OH) complexes of nickel(II) and EDTA-OH and 2,2′-ethylenedioxydi(ethylamine)-<I>N</I>,<I>N</I>,<I>N</I>′,<I>N</I>′-tetraacetate (GEDTA) complexes of cobalt(II) were studied systematically by employing the polarographic technique. The reaction of ethylenediaminetetraacetate (EDTA) with the nitrilotriacetate (NTA) complex of nickel(II) in an alkaline medium was also studied. All the substitution reactions were found to have a common reaction mechanism. They were first-order with respect to DTPA or EDTA and also first-order with respect to the 1:1 ratio metal (II) complex of HIDA, NTA, EDTA-OH, or GEDTA. From a comparison of the observed rate constants with those estimated on the basis of the proposed reaction intermediate, the detailed reaction mechanism and the steric effect of the DTPA anion on the reaction rates were studied. The DTPA anion had practically no effect on the rates of the substitution reactions of the aminopolycarboxylate complexes of metal (II) ions.

• 公益社団法人 日本化学会の論文

著者

• Kodama Mutsuo

  Department Of Chemistry College Of General Education Hirosaki University

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