in acetonitrile Irradiation (UV/VIS); light excitation (>410 nm) of a 1.1E-4 M soln. in acetonitrile containing 0.1 M tetraethylammonium perchlorate (room temp., de-aeration with nitrogen bubbling); anal. of spectral changes;

chloride in dichloromethane Kinetics; byproducts: 2,2'-bipyridine; Irradiation (UV/VIS); at 25°C, excess of Cl(1-) ions; monitored at 455 or 555 nm;

sulfuric acid in water Kinetics; Irradiation (UV/VIS); photoinduced oxidation in acidic solution;