Fe(II)+Fe(III) exchange reaction in concentrated perchloric acid solutions
- 1 January 1966
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 62, 2200-2204
- https://doi.org/10.1039/tf9666202200
Abstract
The electron exchange rate between Fe(II) and Fe(III) is k[Fe(II)][Fe(III)] for solutions containing 1–7 M HClO4 in the temperature range 0 to –84°C. k at 0.3°C shows an unexpected dependence on [HClO4] but for [HClO4]= 7.5 M, ΔS≠= 13.2±1.0 cal deg.–1 mole–1 and ΔE≠= 11.0±0.4 kcal mole–1 over the whole temperature range notwithstanding the facts (a) that the system changes from a liquid to a glass at –56°C and (b) that the specific conductivity shows a discontinuity in Arrhenius parameters at this temperature. It is suggested that electron exchange can occur over long distances in this medium.Keywords
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