PHOTOINDUCED OXIDATION OF AQUEOUS-SOLUTION OF NA-2[MO(V)(2)O(4)EDTA] IN NEUTRAL KBR AND K2S2O8 MEDIUM

When an aqueous solution of Na-2[Mo(V)(2)O(4)EDTA] (ethylene diamine t etraacetate) was photolyzed in the presence of excess KBr and K2S2O8 a t neutral pH, the complex was found to be oxidized due to the reaction s of Br-2(-.) and SO4-., respectively. Oxidation of the complex was al so observed due to the reactions of the complex with radiolytically ge nerated Br-2(-.) and SO4-. radicals. When the oxidation of the complex with SO4-. was conducted in an unbuffered solution, a chain reaction was observed in the oxidation of the complex, The time resolved kineti cs for the formation and decay of different transient intermediates an d the relevant rate constants were investigated with a flash photolysi s technique, and a probable mechanism for the oxidation process was gi ven.