Kinetics and mechanism of oxidation of tellurium(IV) by cobalt(III) in perchloric acid

Summary The kinetics of oxidation of Te^IV by Co^III have been studied in aqueous HClO₄. A mechanism presuming Co(OH₂)₅(OH)]²⁺ to be the reactive species has been proposed, which leads to the rate-equation shown. Rate=–dCo^III]/dt=2kKK _h ² Co^III] _t ² Te^IV]/H⁺]² K_b is the hydrolysis constant of Co^III, K is the formation constant of the complex between Co^III and Te^IV and k is the rate of decomposition of that complex. E_a and S are 95.0±2.1 kJ mol^–1 and 28.3±7.1 JK^–1 mol^–1, respectively.