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Effect of manganese(II) ions on the oxidation of malic and oxaloethanoic acids by aqueous HCrO−4

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Abstract

The catalytic effect of MnII ions on the pseudo-first-order rate constants (k obs) for chromic acid oxidations of malic and oxaloethanoic acids (an oxidation product of malic acid) has been studied spectrophotometrically at 25 °C. The rates show a first-order dependence on the CrVI concentration for each reductant. The order with respect to [malic acid] was found to lie between 1 and 2, and 1 for [oxaloethanoic acid]. The rate increased markedly with increasing [MnII] in both the cases. The catalytic effects of MnII have been ascribed to a one-step three-electron process in which a termolecular complex is formed between the reductant, MnII and HCrO− 4. The intermediate CrIV is ruled out; details of such a process are discussed. Mechanisms in accordance with the experimental data are proposed for the reactions.

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Authors and Affiliations

  1. Chemistry Department, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110 025, India

    Zaheer Khan

  2. Chemistry Department, Aligarh Muslim University, Aligarh, 202 002, India

    Kabir-ud-Din

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  1. Zaheer Khan
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  2. Kabir-ud-Din
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Khan, Z., Kabir-ud-Din Effect of manganese(II) ions on the oxidation of malic and oxaloethanoic acids by aqueous HCrO−4. Transition Metal Chemistry 26, 672–678 (2001). https://doi.org/10.1023/A:1012056310950

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