PHOTOCHEMICAL STUDIES ON AQUEOUS CARBOPLATIN

The photochemical products, quantum yields and mechanisms of aqueous C arboplatin have been studied at 313 and 254 nm irradiation. Excitation in the ligand field bands 1A1-->1A2 and 1A1-->1E leads to substitutio n reactions, giving diaquodiammineplatinum and tetraaquoplatinum. And then these complexes undergo thermally hydrolysis and polymerization p roducing polymeric hydroxo-bridged complexes. Oxygen is not involved i n the reactions. Excitation in the charge-transfer band 1A1-->1A2u res ults in redox reaction. Metallic platinum and diaquodiammineplatinum a re formed, respectively, in the absence and the presence of oxygen.