Abstract: The electrochemical behavior of mononuclear and symmetrical binuclear ruthenium（Ⅱ） complexes [Ru1:Ru(bpy)2DIPB(ClO4)2,Ru2:(bpy)2 Ru(DIPB)Ru(bpy)2(ClO4)4,Ru3:Ru(phen)2DIPB(ClO4)2 and Ru4:(phen)2 Ru(DIPB)Ru (phen)2(ClO4)4] containing binuclear ligand 2,2′-bipyridine(bpy)，1,10-phenanthroline(phen) and bridging ligand 1,4-di-[2-imidazo[4,5-f][1,10] phenanthroine benzene(DIPB) on a platinum electrode and the intermetallic interaction of binuclear complexes have been investigated using cyclic voltammetry,cyclic ac voltammetry and differential capacitance techniques,etc.In acetonitrile solution with a concentration of 0.1 mol穌m-3 TBAP,the central ions in four complexes all display single 1e and 2e reversible oxidation- reduction waves on the cyclic voltammograms,with apparent diffusion coefficients of the mononuclear complexed cations being larger than that of the binuclear ones.The apparent diffusion coefficients for complexed cations with auxiliary ligands bpy are also found to be larger than that with ligands phen.It appears that the overlapping of two continuous single-electron processes by cyclic ac voltammetry and differential capacitance techniques occurs during the redox processes of the central ions binuclear complexes.The results show that a weak electronic interaction exits between the two central ruthenium ions in binuclear complexes.

Key words: Ruthenium(Ⅱ) complex, Platinum electrode, Central ion, Electrochemial behavior, Cyclic voltammetry, Alternating current voltammetry