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A kinetic study of the complex formation between aquachromium(III) ions and L-iso-leucine

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Summary

The kinetics of complex formation between aquachromium(III) ions and L-iso-leucine have been studied spectrophotometrically. Effects of varying the total chromium(III), total amino acid and H+ concentrations, ionic-strength, temperature and % EtOH on the kohs were determined. The results are best accounted for by outer-sphere complexation equilibria involving HL (the amino acid zwitterion) and [Cr(H2O)6]3+/[Cr(H2O)5OH]2+ which precede anations. A rate-equation is established which involves Kos1, Kos2, k1, k2 (the respective outer-sphere complexation and interchange rate constants with [Cr(H2O)6]3+ and [Cr(H2O)5OH]2+), Ka and Kh (the acid-dissociation constants of H2L+⇋HL and [Cr(H2O)6]3+⇋ [Cr(H2O)5OH]2+ pairs). The proposed mechanism is Ia for the path involving hexaaqua- and Id for that involving hydroxopentaaquachromium(III).

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Author notes

  1. Kabir-ud-Din

    Present address: Department of Chemistry, Faculty of Science, Garyounis University, P.O. Box 9480, Benghazi, Libya

Authors and Affiliations

  1. Department of Chemistry, Aligarh Muslim University, 202002, Aligarh, India

    Kabir-ud-Din & Ghulam Jilani Khan

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  1. Kabir-ud-Din
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  2. Ghulam Jilani Khan
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Kabir-ud-Din, Khan, G.J. A kinetic study of the complex formation between aquachromium(III) ions and L-iso-leucine. Transition Met Chem 15, 39–42 (1990). https://doi.org/10.1007/BF01032229

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  • DOI: https://doi.org/10.1007/BF01032229

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