SPECTRAL CHARACTERIZATION OF THE ONE-ELECTRON OXIDATION-PRODUCT OF THIOCYANATO)BIS(4,4'-DICARBOXYLATO-2,2'-BIPYRIDYL) RUTHENIUM(II) COMPLEXUSING PULSE-RADIOLYSIS

The spectral characterization of the oxidized form of(ruthenium(II) ci s-di(isothiocyanato)bis(4,4'-dicarboxy 2,2'-bipyridyl), (commonly know n as N3-dye) in aqueous solution is made by reacting the title compoun d with pulse radiolytically generated radicals N-3(.) and Br-2(-.) The one-electron oxidized form of Ru(LI)-dye initially formed in both the se oxidation reactions shows absorption maxima at 320 and 740 nm. Foll owing radiolysis, the one-electron oxidized form of Ru(II)-dye undergo es further transformations to yield a stable product that exhibits a c haracteristic absorption maximum at 440 nm. Our preliminary results pr ovide the spectral evidence for the formation of two different species that follow the oxidation of Ru(II)-dye.