The catalytic reaction kinetics of water-soluble manganese porphrin complex, 5Mn^Ⅲ(TMPyP) with NaOCl of room temperature at different pH has been investigated by the rapid-mixing stopped-flow techniques. The reaction mechanism was proposed. At lower pH values HOCl was the main oxidant and the short-lived intermediate (1) could not be fully formed, whereas the relatively stable intermediate (2) was produced. At higher pH OCl^- was the main oxidant and high-valent oxomanganese (Ⅴ) porphyrin (1) was fully formed, which then decayed to oxoMn(Ⅳ). It was shown by using reducing substrates that the high-valent oxomanganese (Ⅴ) porphyrin was the reactive comlexes.

Key words: MANGANESE COMPLEX, PORPHYRIN, SODIUM HYPOCHLORITE, INTERACTIONS, CATALYTIC REACTION, REACTION MECHANISM, REACTION KINETICS