Summary
The bromate ion reduction by 12-tungstocobaltate(II) anion has been investigated. The reaction obeys the empirical rate law:-d[reductant]/dt=5(a+b[H+]2)[BrO −3 ][reductant]: where a=(2.49±0.18)×10−4M−1 s−1, b=(4.65±0.20)×10−5M−3s−1 at 24.5±0.1°C [H+]=0.05–1.50M and I=2.0M (NaClO4). This rate law is interpreted in terms of parallel reactions of BrO −3 and H2BrO +3 . On the basis of the observed anion catalysis, substitution intertness of the reductant and Marcus type linear free energy relations, the outer sphere mechanism is proposed for both pathways.
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Ayoko, G.A., Iyun, J.F. & Faskari El-Idris, I. Electron transfer at tetrahedral cobalt(II). Part 1. Kinetics of bromate ion reduction. Transition Met Chem 16, 145–148 (1991). https://doi.org/10.1007/BF01032820
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DOI: https://doi.org/10.1007/BF01032820