Abstract: We studied the reaction kinetics of superoxide dismutase and its model compounds μ-bridge-bis-N,N'-1,3-propylene bis(2,6-diacetylpyridine)iminato copper( Ⅱ )(bridge being SCN^-,N₃^-, I^-, Br^-,Cl^- and OH^-)by modified illumination method and the rate constants k_Q of the reaction were obtained. k_Q measured for superoxide dismutase is in agreement with those measured by pulse radiolysis and xanthine oxidase method. Among the six complexes, Cu₂L(SCN)(ClO₄) has a maximum value of k_Q and Cu₂L(N₃)(ClO₄)₃ has a minimum one. The reason for different values of k_Q was discussed based on the present results and previous paper.

Key words: Illumination method, Superoxide ion, Superoxide dismutase, Model compound of supero-xide dismutase, Rate constant of reaction