Spectral characterization of the one-electron oxidation product of cis-bis(isothiocyanato)bis(4,4'-dicarboxylato-2,2'-bipyridyl) ruthenium(II) complex using pulse radiolysis

Abstract

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 N₃^• and Br₂^-•. The one-electron oxidized form of Ru(II)-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.