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Published on: March 12, 2015
Oxidation of ferrocenes by copper(II) in aqueous acetonitrile: nitrate and chloride ion effects
Japhet Irangu1, Robert B Jordan
1Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.
Abstract:
The effect of nitrate and chloride ion on the rate of oxidation of ferrocene (Fc) and 1,1'-dimethylferrocene (DmFc) by Cu(II) has been studied in 95% and 80% acetonitrile/water solutions. The complex formation constants for Cu(II) with the same anions in the same media have been determined by spectrophotometry. Nitrate ion mildly inhibits the reaction, while chloride ion substantially increases the rate. The results have been analyzed in terms of the Marcus theory, and it is concluded that complexation increases the rate of self-exchange between the CuII(X)n and CuI(X)n species. In the case of nitrate, the latter effect is compensated for by a less favorable overall equilibrium constant, which results in mild inhibition.
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