Kinetic Study of the Oxidation of Catechol by Aqueous Copper(II)
The kinetics of the oxidation of catechol by aqueous copper(II) have been studied as a function of reactant concentrations at pH 6.4−7.2. To follow the reaction, a spectrophotometric method has been developed that circumvents the problem of precipitation of decomposition products of the initial o-qu...
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| Published in | Inorganic chemistry Vol. 41; no. 12; pp. 3076 - 3083 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
American Chemical Society
17.06.2002
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| Online Access | Get full text |
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| Summary: | The kinetics of the oxidation of catechol by aqueous copper(II) have been studied as a function of reactant concentrations at pH 6.4−7.2. To follow the reaction, a spectrophotometric method has been developed that circumvents the problem of precipitation of decomposition products of the initial o-quinone oxidation product. The rate law shows that the reactive species is the monocatecholate complex of CuII, and that this species undergoes rate-limiting intramolecular electron transfer with k = 1.9 × 10-5 s-1 (22 ± 1 °C, μ = 0.125 M NaClO4). The results have allowed a reanalysis of previous work on the autoxidation in the aqueous CuII−catechol−dioxygen system, and comparisons to mechanisms of copper(II) oxidases. |
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| Bibliography: | istex:F4B425556F6321FADE154AA25542AF050DCBB906 ark:/67375/TPS-8TC683GW-G ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0020-1669 1520-510X |
| DOI: | 10.1021/ic010978c |