Abstract
Abstract Acid-catalysed dissociation of malonato- and succinatobis(ethylenediamine) cobalt(III) has been studied kinetically in aqueous acidic media (0.05–1.0 mol dm−3) over a temperature range of 40–80°C. The variation of observed pseudo-first-order rate constants on [acid] suggests the operation of two concurrent paths with kobs [dbnd] ko + kH+[H+], where ko and kH+ are the appropriate rate constants for spontaneous and acid-catalysed pathways respectively. The influence of basicity and chelate ring size of the carboxylato chelate on the rate and activation parameters for the acid-catalysed path has been discussed. Analysis of the rate data corresponding to kH+ suggests a dissociative mechanism involving the protonated complex.
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