A bridged cluster species of formula [Ru 3 O(CH 3 COO) 6 (py) 2 (4,4'-bpy)Ru(bpy) 2 (Cl)](PF 6 ) 2 (py=pyridine, bpy=2,2'-bipyridine, 4,4'-bpy=4,4'-bipyridine) has been synthesized and characterized based on electronic and 2D NMR spectroscopy, cyclic voltammetry and UV-Vis spectroelectrochemistry. The electronic spectra of the complex exhibit the characteristic MLCT band for the [Ru(bpy) 2 Cl] + moiety at 489 nm, and a broad band at 692 nm ascribed to [Ru 3 O] internal core transitions. The complex exhibit a reversible multistep redox behavior in the range from -1.5 to 2.5 V (SHE), consisting of five monoelectronic waves at -1.31, -1.06, 0.15, 1.17 and 2.09 V ascribed to [Ru 3 O] core redox processes, and at 0.98 V ascribed to the [Ru(bpy) 2 Cl] + / + 2 redox couple. Both Ru + 2 / + 3 pair and [Ru 3 O] - 1 / 0 / + 1 processes are influenced significantly by the electronic interactions through the 4,4'-bipyridine bridging ligand.