PHOTOCHEMICALLY INDUCED ELECTRON-TRANSFER BETWEEN SULFUR-DIOXIDE AND TIN(IV) MONO-PHTHALOCYANINE AND DI-PHTHALOCYANINE

Photolysis, using radiation from a tungsten lamp, of tin diphthalocyan ine (Pc(2)Sn(IV)) in dichloromethane containing SO2 results in the one -electron oxidation of this species to [Pc(-2)Sn(IV)Pc(-1)](+). The re lative quantum yields for the formation of the oxidized species were i n the order of 10(-3). The one-electron oxidized complex was also form ed when Pc(2)Sn was photolysed in an acetonitrile/dichloromethane solv ent mixture. Photolysis of the monomeric (L)(2)Sn(IV)Pc (L = OH-, Cl-, Br- and F-) in pyridine and in the presence of SO2 resulted in the re duction of these species to (L)(2)Sn(IV)Pc(-3)](-) with quantum yields in the order of 10(-2).