A study on dismutation mechanism of superoxide ion by a macrocyclic copper(II) complex of dioxotetraamine |
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| Affiliation: | 1. University of Rome ‘Tor Vergata’, Department of Chemical Sciences and Technologies, Via della Ricerca Scientifica, 00133 Rome, Italy;2. The Procter & Gamble Company, Mason Business Center, 8700 Mason Montgomery Road, Mason 45404, USA;3. Procter & Gamble Italia S.p.A., Via Ardeatina 100, 00144 Pomezia, Italy |
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| Abstract: | The mechanism of catalytic dismutation of superoxide anion by copper(II) complex of 12-(4′-nitro)-benzyl-1,4,7,10-tetraazacyclotridecane-11,13-dione was studied by using pulse radiolysis and cyclic voltammetry. The redox potential of Cu(II)/Cu(III) was obtained to be E0=0.590 V (SCE) in solution of 0.5 mol·dm−3 Na2SO4. The rate constant of catalytic dismutation was determined to be kcat=1.9×106 (pH=7.0) and 1.1×106 mol·dm3·s−1 (pH=7.8) by pulse radiolysis and it was suggested that mechanism of catalytic dismutation of O2− is alternate oxidation and reduction of Cu(II) complex by O2−. |
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