A Kinetic Study on Dismutation of Superoxide Ion by Macrocyclic Dioxotetramine-Copper(Ⅱ) Complex by Using Pulse Radiolysis

Chem. J. Chinese Universities ›› 1990, Vol. 11 ›› Issue (12): 1322.

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A Kinetic Study on Dismutation of Superoxide Ion by Macrocyclic Dioxotetramine-Copper(Ⅱ) Complex by Using Pulse Radiolysis

Shen Meng-chang¹, Luo Qin-hui¹, Zhu Shou-rong¹, Tu Qing-yun¹, Dai An-bang¹, Liu An-dong², Gu Hong-chun², Li Feng-mei², Di Shao-jie²

1. Coordination Chemistry Institute, Nanjing University, Nanjing 210008;
2. Institute of Law Energy Nuclear Physics, Beijing Normal University, Beijing 100875

Received:1990-08-21 Online:1990-12-24 Published:1990-12-24

Abstract

Abstract: We studied the reaction kinetics of dismutation for superoxide ion by copper ( Ⅱ ) complex of macrocyclic dioxotetramine ligand 12-(4'-nitro)-benzyl-1,4,7,10-tetraazacyclotridecane-11, 13-dionato copper( Ⅱ )by using pulse radiolysis. The rate constants of dismutation k_cat were obtained to be 1. 78×10⁶ mol^-1·L-s^-1(at pH 7.0) and 1.06×10⁶ mol^-1·L·s^-1(at pH 7.8). The reaction mechanism is similar to that catalyzed by superoxide dismutase.

Key words: Pulse radiolysis, Superoxide ion, Reaction rate, Dismutation, Macrocyclic dioxote-tramine-copper(Ⅱ) complex

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Shen Meng-chang, Luo Qin-hui, Zhu Shou-rong, Tu Qing-yun, Dai An-bang, Liu An-dong, Gu Hong-chun, Li Feng-mei, Di Shao-jie. A Kinetic Study on Dismutation of Superoxide Ion by Macrocyclic Dioxotetramine-Copper(Ⅱ) Complex by Using Pulse Radiolysis[J]. Chem. J. Chinese Universities, 1990, 11(12): 1322.

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A Kinetic Study on Dismutation of Superoxide Ion by Macrocyclic Dioxotetramine-Copper(Ⅱ) Complex by Using Pulse Radiolysis

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