Summary
Oxidation of the FeII chelates [FeL] (L = phen or bipy) by CrVI and MnVII in H2SO4 medium was found to proceed through the formation of a bimetallic insertion complex which decomposes in the slow step, followed by electron transfer from [FeL] to the oxidant. The reactions are catalysed by both anionic and non-ionic micelles [SDS and triton-x (Tx), respectively]. A mechanism is suggested involving electrostatic stabilization of the cationic forms of the FeII chelates by anionic SDS and the partial anionic character of polyoxyethylene moiety of Tx, respectively. The marginal catalysis of cationic micelles (CTAB) is attributed to co-anion-micellar interactions.
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Lakshmi, P.J., Rajanna, K.C. & Saiprakash, P.K. Mechanism of oxidation of iron(II) chelates by hexavalent chromium and heptavalent manganese in aqueous sulfuric acid and micellar media - a kinetic approach. Transition Met Chem 21, 135–141 (1996). https://doi.org/10.1007/BF00136543
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DOI: https://doi.org/10.1007/BF00136543