Studies on outer-sphere electron transfer between iron(II) and some surfactant–cobalt(III) complexes in micelles as well as in β-cyclodextrin

The kinetics and mechanism of iron(II) reduction of the surfactant–cobalt(III) complex ions, cis-[Co(bpy)2(C12H25NH2)2]3+, cis-[Co(phen)2(C12H25NH2)2]3+ (bpy = 2,2′ bipyridine, phen = 1,10 phenanthroline, C12H25NH2 = dodecylamine) in self-micelles were studied at different temperatures. Experimentally the reaction was found to be second order and the electron transfer postulated as outer-sphere. The second order rate constant for this electron transfer reaction for both the complex ions was found to increase with increase in the initial concentration of these surfactant–cobalt(III) complex ions. The effect of inclusion of the long aliphatic chain of the surfactant complex ions into β-cyclodextrin on these reactions has also been studied.