Abstract
Three chromium(III) complexes of general formula [Cr(ox)2(Aa)]2− (Aa is an α-amino acid, namely alanine, valine or cysteine) were obtained and characterized in solution. In acidic solutions, [Cr(ox)2(Aa)]2− undergo acid-catalysed aquation to cis-[Cr(ox)2(H2O)2]− and the appropriate amino acid. The process goes through a metastable intermediate with monodentate amino acid coordinated via the carboxylate oxygen atom. The kinetics of the chelate ring opening were studied under isolation conditions. The determined pseudo-first-order rate constants were linearly dependent on [H+]. A mechanism is proposed, in which the reactive form of substrate is in the form of the conjugate acid.
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