Abstract
By using the technique of pulse radiolysis to generate 02-, it is demonstrated that copper 1,10-phenanthroline ((op)2Cu2+) is capable of catalytically dismutating 02- with a “turnover” rate constant kcat = (5.1 ± 0.9) X 108 M-1 s-1. The rate constants of the reduction of (op)2Cu2+ and of the oxidation of (op)2CU+ by O2- have been determined to be (1.93 ± 0.07) X 109 and (2.95 ± 0.3) X 108 M-1 s-1, respectively. The kinetic results of the oxidation of (op)2CU+ by molecular oxygen in aqueous solution are interpreted by a mechanism that proceeds via a superoxide intermediate, and the rate constant k-10 = (5.0 ± 0.3) X 104 M-1 s-1 has been determined. The rate constant of the oxidation of (op)2CU+ by H2O2 was measured to be k22 = (937 ± 20) M-1 s-1.
Original language | English |
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Pages (from-to) | 7276-7280 |
Number of pages | 5 |
Journal | Journal of the American Chemical Society |
Volume | 105 |
Issue number | 25 |
DOIs | |
State | Published - Nov 1983 |