Electrochemical Behavior of Dimethyl Sulfone on Platinum Electrode.

The effect of dimethyl sulfone (DMSО2) on the rates of anodic oxygen evolution and cathodic hydrogen evolution on the platinum electrode in acidic and alkaline media is studied. Quantum chemical calculations on the theoretical level PBE/def2-TZVP show that in the dimethyl sulfone molecule, the break of the C–S bond is preferred over the С–Н bond break and the process itself proceeds by the radical-ion mechanism. The NMR and Raman spectroscopic studies show that the final products of the anodic oxidation of dimethyl sulfone are methanesulfonic acid and dimethyldisulfone in the acidic medium and only dimethyldisulfone in the alkaline medium. The final products of the cathodic reduction of DMSO2 are dimethylpolysulfides. Based on experimental results, a scheme of the electrocatalytic behavior of dimethyl sulfone of the platinum electrode is proposed. [ABSTRACT FROM AUTHOR]