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Kinetic Studies on Pentaammine Cobalt(III) Complexes of α-Hydroxy Acids by Manganese(IV) Heteropolyanion in Micellar Medium

T. Palanisamy, P. Rajkumar and K. Subramani

The oxidation of pentaamminecobalt(III) complexes of α -hydroxy acids by manganese(IV) heteropolyanion (HPA) in micellar medium yields nearly 100% of carbonyl compounds and 100% Co(II) as ultimate products. In this reaction, the rate of oxidation show s first order kinetics each in [Co(III)] and [HPA]. The unbound α -hydroxy acids yield about 100% of carbonyl compounds in presence of micelles. The rate of oxida tion of Co(III) complexes of both; boun d and unbound α -hydroxy acids are enhanced more in the presence of cati onic micelle of cetyltrimethylammonium bromide (CTAB), when compared to the anionic micelle of sodium dodecyl sulphate (SDS). The 1 mole of cobalt(III) complexes of α -hydroxy acids reacts with nearly 0.5 mole of Mn(IV) heteropolyanion, similarly 1 mole of α -hydroxy acids reacts with nearly 1 mole of Mn(IV) heteropolyanion. The kinetic and stoichiometric results have been accounted by a suitable mechanism.