Abstract
Abstract Reaction of the edta (ethylenediaminetetraacetate) complex of ruthenium(III) with cysteine has been studied spectrophotometrically as a function of [cysteine], pH (1.3–9.5) and temperature (20–45°) in aqueous solution. Stopped-flow kinetic studies revealed that the substitution is first-order in both reactants. A maximum observed rate constant (kobs) was obtained in the pH region 7.8–8.0 which is in contrast to the characteristic bell-shaped kobs-pH profile for the substitution of Ru(III)-edta reported so far the (where maximum kobs is usually attained in the pH range 4.5–6.0). Activation parameters determined from the temperature dependence of observed rate constants at pH = 5.0 are comparable to those for other thio-ligand substitutions and consistent with the proposed mechanism.
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