The influence of tetraethylammonium perchlorate on the electrode kinetics of Eu3+ in dimethylsulfoxide

The effect of different concentrations of the supporting electrolyte tetraethylammonium perchlorate on the standard electrode reaction rate constants for the one-electron reduction of Eu(CF3SO3)3 on mercury in dimethylsulfoxide has been measured. Two techniques, (i) ac polarography on the dropping mercury electrode and (ii) cyclic voltammetry in a two electrode system were employed. The ac data was evaluated both by the Randles and the by Sluyters methods. The standard reaction rates from cyclic voltammetry were extracted via a simulation program. Viscosities, resistivities, densities and the double layer capacitances of the electrolytes are given. Correlations between electrolyte properties and the -values are discussed. The standard electrode reaction rates were analyzed according to the Frumkin theory.