Electron transfer at tetrahedral cobalt(II). Part V: kinetics of permanganate ion reduction |
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| Authors: | Godwin A. Ayoko John Arabel |
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| Affiliation: | (1) Department of Chemistry, University of Papua New Guinea, Box 320, University Post Office, Papua New Guinea |
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| Abstract: | Summary The kinetics and mechanism of the reduction of MnO4 − by CoW12O4O6− in aqueous HC1O4 were studied. The reaction follows the rate law:-d[MnO inf4 sup− ]/dt = 5K a k[H+][MnO inf4 sup− ][CoW12O4O6−] with K a = 2.99 × 10−3mol−1 dm3 and k = 2.00 ± 0.02 × 103dm6mol−2s−1 at 25°C. Close agreement between k obs and k calc on the basis of Marcus theory suggest an outersphere mechanism operates. Alkali metal ions catalyse the reaction in the order K+ > Na+ > Li+ and this result has been rationalized. |
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