KINETICS OF ELECTROREDUCTION OF TIN(II) AT MERCURY IN DIMETHYLFORMAMIDE SOLUTIONS

Kinetic data for the electroreduction of Sn(II) have been obtained by the pulse polarographic technique at a dropping mercury electrode in dimethylformamide solutions containing various tetraalkylammonium perchlorates as supporting electrolytes. The diffusion coefficients, formal potentials and kinetic parameters were determined. The standard rate constant changed with the size of the electrolyte cation in the order TBA+ > TEA+ > TMA+. The variation in the kinetic parameters with the supporting electrolyte is analysed considering the double-layer effects for these systems and the nature of the rate-determining step in the electroreduction reaction.