in acetic acid Kinetics; Irradiation (UV/VIS); Deaerated solns. of Cr(phen)3(3+) at pH 3-9 (Britton-Robinson buffer; same concn. of phosphoric, acetic, and boric acids) were subjected to prolonged sequential biphotonic excitations (λexc approx. 440 nm and λphot approx. 520 nm).;

oxygen in water Kinetics; react. followed by UV at 22 ° C, quenching by Na2C2O4 investigated;