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Methionine anation of aquachromium(III)

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Summary

The kinetics of anation of chromium(III) species, [Cr(H2O)6]3+ and [Cr(H2O)5OH]2+, by DL-methionine have been studied spectrophotometrically. Effects of varying [methionine]T, [H+], μ and temperature were investigated. The results are in accord with a mechanism involving a fast 1∶1 outer-sphere association between chromium(III) species and amino acid zwitterion, followed by transformation of the outer-into inner-sphere complex by slow interchange. The rate law consistent with the mechanism is as follows:

$$k_{obs} = \frac{{(k_1 K_a K_{OS1} [H^ + ] + k_2 K_a K_h K_{OS2} )(Methionine)_T }}{{[H^ + ]^2 + K_a [H^ + ] + K_h [H^ + ] + K_a K_h + (K_a K_{OS1} [H^ + ] + K_a K_h K_{OS2} )[Methionine]_T }}$$

The rate parameters were evaluated and associated activation parameters were calculated using the Eyring equation. Comparison of the results with published data on this metal ion provide evidence of an Ia mechanism for k1 and Id mechanism for k2 routes (k1 route involves metal ion species [Cr(H2O)6]3+ and k2 route involves [Cr(H2O)5OH]2+).

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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

    Iqrar A. Khan, Mohammad Shahid &  Kabir-ud-Din

Authors
  1. Iqrar A. Khan
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  2. Mohammad Shahid
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  3. Kabir-ud-Din
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Khan, I.A., Shahid, M. & Kabir-ud-Din Methionine anation of aquachromium(III). Transition Met Chem 16, 18–22 (1991). https://doi.org/10.1007/BF01127863

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  • DOI: https://doi.org/10.1007/BF01127863

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