ChemInform Abstract: Electrolyte Solutions in Liquid Ammonia. Part 10. A Cyclic Voltammetric Examination of Electron Transfer Between Solvated Ruthenium(III) and Ruthenium(II) Cations, and Anodic Passivation of Platinum Electrodes.

Abstract

018ChemInform Abstract Single electron transfer between Ru(NH3)63+ and Ru(NH3)62+ at a Pt electrode in liquid NH3 closely follows Nernstian behavior during the first voltammetric cycle if the voltage sweep rate is low. Deviation from voltammetric reversibility is observed with increasing voltage ramp rate, Ru(III) concentration, and increasing number of applied voltammetric cycles. XPS results obtained for the Pt surface after anodic polarization at potentials > 0.3 V reveal that the Pt surface is oxidized in liquid NH3 to a gold-colored compound containing equimolar amounts of Pt(II) and Pt(IV).