不稳定性
化学
铜
钴
金属
离子强度
无机化学
水溶液中的金属离子
离子键合
药物化学
离子
物理化学
水溶液
有机化学
出处
期刊:Journal of The Chemical Society-dalton Transactions
日期:1984-01-01
卷期号: (5): 903-903
被引量:2
摘要
Reactions between copper(II) and polyaminocarboxylato-complexes of cobalt(II) have been studied by a stopped-flow spectrophotometric technique at an ionic strength I= 0.10 mol dm–3 and 25 °C. Competitive associative and dissociative steps are observed with different dependences on the entering metal and on acidity. The rates of the reactions shift from first to zero order in [Cu2+] in the case of ethylenediaminetetra-acetate and ethylenebis(oxyethylenenitrilo)-N,N,N′N′-tetra-acetate, while only first-order behaviour is observed for ethylenedi-imino-N,N′-diacetate and N-(2-hydroxyethyl)-ethylenedinitrilo-N,N′,N′-triacetate. For all the reactions evidence is given for a stepwise unwrapping mechanism followed by attack of Cu2+ to give a binuclear intermediate. Experimental reactivities are compared with those computed according to the substitution lability of the exchanged metal ions and the stability of the proposed intermediate.
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