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Kinetic studies on acid-catalysed aquation of some [Cr(ox)2(amino acid)]2− complexes

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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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  1. Faculty of Chemistry, Nicolaus Copernicus University, 87-100, Toruń, Poland

    Ewa Kita & Rafał Lisiak

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  1. Ewa Kita
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  2. Rafał Lisiak
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Correspondence to Ewa Kita.

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Kita, E., Lisiak, R. Kinetic studies on acid-catalysed aquation of some [Cr(ox)2(amino acid)]2− complexes. Transition Met Chem 36, 855–860 (2011). https://doi.org/10.1007/s11243-011-9540-9

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  • DOI: https://doi.org/10.1007/s11243-011-9540-9

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