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Two novel RuIIcomplexes [Ru(dppt)(bpy)Cl]ClO4(1)and [Ru(pta)(bpy)Cl]ClO4(2)[dppt, pta and bpy = 3-(1,10-phenanthrolin-2-yl)-5,6-diphenyl-as-triazine, 3-(1,10-phenanthrolin-2-yl)-as-triazino[5,6-f]acenaphthylene and 2,2′-bipyridine, respectively] were synthesized and characterized by elemental analysis and electrospray mass spectrometry, 1H-n.m.r., and u.v.–vis spectroscopy. The redox properties of the complexes were examined using cyclic voltammetry. Due to the strong π-accepting character of asymmetric ligands, the MLCT bands of (1)and (2)are shifted significantly to lower energies by comparison with [Ru(tpy)(bpy)Cl]+.