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The results of investigation of Mn 2+ electrooxidation mechanism in the presence of acetate ions have been presented. The kinetic measurements were supplemented by quantum-chemical modeling. The calculated value of the redox potential of [Mn(H 2 O) 5 Ac] + /[Mn(H 2 O) 5 Ac] 2+ system was compared with experimental data obtained at pH 5.2. The similar values have given a reason to assume the direct electrooxidation of ion Mn 2+ to Mn 3+ like complex [Mn(H 2 O) 5 Ac] + . The process occurs according to inner-sphere mechanism due to direct contact of the complex with the electrode through the carboxyl group. The quantum-chemical calculations have shown the impossibility of elimination of second electron without considerable reorganization of the complex [Mn(H 2 O) 5 Ac] 2+ . The final product of electrooxidation of Mn 2+ acetate complex, manganese dioxide, was formed as a result of [Mn(H 2 O) 5 Ac] 2+ disproportionation with subsequent hydrolysis of the [Mn(H 2 O) 5 Ac] 3+ complex. In weakly acidic solution (pH above 4) due to reducing the number of [Mn(H 2 O) 5 Ac] + complexes, electrooxidation of manganese ions were occurred by a similar mechanism to the acid sulphate solution, i. e. by radicals, p roduced by electrooxidation of water molecules.

Особливостi електроокиснення Mn<sup>2+</sup> до MnO<sub>2</sub> в ацетатному електролiтi