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Kinetic studies on H+-catalysed aquation of some chromium(III)-oxalato-amino acid complexes

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Abstract

The following chromium(III) complexes with serine (Ser) and aspartic acid (Asp) were obtained and characterized in solution: [Cr(ox)2(Aa)]2− (where Aa = Ser or Asp), [Cr(AspH−1)2]− and [Cr(ox)(Ser)2]−. In acidic solutions, [Cr(ox)2(Aa)]2− undergoes acid-catalysed aquation to cis-[Cr(ox)2(H2O)2]− and the appropriate amino acid. [Cr(ox)(Ser)2]− undergoes consecutive acid-catalysed Ser liberation to give [Cr(ox)(H2O)4]+, and the [Cr(Asp)2]− ion is converted into [Cr(Asp)(H2O)4]2+. Kinetics of these reactions were studied under isolation conditions. The determined rate expressions for all the reactions are of the form: k obs = a + b[H+]. Reaction mechanisms are proposed, and the meaning of the determined parameters has been established. Evidence for the formation of an intermediate with O-monodentate amino acid is given. The effect of the R-substituent at the α-carbon atom of the amino acid on the complex reactivity is discussed.

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Authors and Affiliations

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

    Hasan Marai, Ewa Kita, Joanna Wojciechowska & Paula Wróbel

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  1. Hasan Marai
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  2. Ewa Kita
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  3. Joanna Wojciechowska
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  4. Paula Wróbel
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Correspondence to Ewa Kita.

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Marai, H., Kita, E., Wojciechowska, J. et al. Kinetic studies on H+-catalysed aquation of some chromium(III)-oxalato-amino acid complexes. Transition Met Chem 37, 215–223 (2012). https://doi.org/10.1007/s11243-012-9579-2

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  • DOI: https://doi.org/10.1007/s11243-012-9579-2

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