Ru(PPh3)2(dcbipy)Cl2 (PPh3=triphenylphosphine, dcbipy=2,2′-bipyridyl-4,4′-dicarboxylate) was prepared to use as a TiO2 sensitizer in wet regenerative photoelectrochemical cells. The complex has been structurally characterized by IR, Raman, ES-MS and NMR spectroscopies. The broad bands in the visible spectrum as well as the reversibility of the redox couple RuII–RuIII, established by cyclic voltammetry, make this complex potentially beneficial for the photosensitization process.