The spectral characterization of the oxidized form of(ruthenium(II) cis-di(isothiocyanato)bis(4,4＇-dicarboxy 2,2＇-bipyridyl), (commonly known as N3-dye) in aqueous solution is made by reacting the title compound with pulse radiolytically generated radicals N-3(.) and Br-2(-.) The one-electron oxidized form of Ru(LI)-dye initially formed in both these oxidation reactions shows absorption maxima at 320 and 740 nm. Following radiolysis, the one-electron oxidized form of Ru(II)-dye undergoes further transformations to yield a stable product that exhibits a characteristic absorption maximum at 440 nm. Our preliminary results provide the spectral evidence for the formation of two different species that follow the oxidation of Ru(II)-dye.