Mechanisms of the Dismutation of Superoxide Catalyzed by the Copper(II) Phenanthroline Complex and of the Oxidation of the Copper(I) Phenanthroline Complex by Oxygen in Aqueous Solution

Sara Goldstein, Gidon Czapski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

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 languageEnglish
Pages (from-to)7276-7280
Number of pages5
JournalJournal of the American Chemical Society
Volume105
Issue number25
DOIs
StatePublished - Nov 1983

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