Synthesis and electrochemistry of [Ru(2,2′-bpy)3]2[S2Mo18O62] at electrode-solvent (electrolyte) interfaces

Abstract

Addition of [Ru(bpy)3][PF6]2 to [(C6H13)4N]4[S2Mo18O62] in CH3CN resulted in the formation of analytically pure [Ru(bpy)3]2[S2Mo18O62]. Insolubility in CH3CN and solubility in DMF allow solid state and solution phase electrochemical data to be compared. Voltammetric studies of [Ru(bpy)3]2[S2Mo18O62] adhered to a glassy carbon electrode surface and placed in contact with CH3CN (0.1 M Bu4NPF6) indicate diffusion of ions within the solid occurs rapidly in order to achieve charge neutralisation required for oxidation of the [Ru(bpy)3]2+ cation and reduction of the [S2Mo18O62]4− anion. Mass increases on the electrode surface (detected by the electrochemical quartz crystal microbalance method) acc..