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Mechanism of oxidation of iron(II) chelates by hexavalent chromium and heptavalent manganese in aqueous sulfuric acid and micellar media - a kinetic approach

✍ Scribed by Parupalli J. Lakshmi; Kamatala C. Rajanna; Pondichery K. Saiprakash

Publisher: Springer
Year: 1996
Tongue: English
Weight: 534 KB
Volume: 21
Category: Article
ISSN: 0340-4285
DOI: 10.1007/bf00136543

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✦ Synopsis

Oxidation of the Fe n chelates [FeL l (L = phen or bipy) by Cr w and Mn TM in H2SO 4 medium was found to proceed through the formation of a bimetallic insertion complex which decomposes in the slow step, followed by electron transfer from [FeLl 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 Fe" 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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