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Kinetics and mechanism of oxidation of Fe2+ by the tris(biguanide)manganese(IV) ion in aqueous acid media
, R. Mukherjee, S. Mukhopadhyay, R. Banerjee
Published in
Issue: 14
Pages: 2950 - 2955
Tris(biguanide)manganese(IV), [Mn(LH2)3]4+ (LH2 = biguanide, C2N5H7), quantitatively oxidises Fe2+ to Fe3+ and is itself reduced to Mn2+ with almost quantitative (> 95%) release of biguanide, The reaction rate strongly depends on added Fe3+; in the presence of externally added Fe3+, the reaction shows a clear first-order dependence in [MnIV], whereas in the absence of any added Fe 3+, an initial quick loss of MnIV is associated with a subsequent very sluggish decay. Two consecutive one-electron transfer inner-sphere steps are proposed for the entire redox process where [Mn(LH 2)3]3+, the initial one-electron-reduced product of MnIV, is believed to be a steady-state intermediate. © Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
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