Abstract
Electron-exchange has been observed between cations in ice media. The overall reaction rate constant for the Fe(II)Fe(III) electron-exchange reaction at −78°C in the eutectic frozen from an aqueous solution initially 0·55 M in HClO 4 is 2·1 ± 0·3 × 10 −3 sec −1M −1. As in liquid water the process is first order in each reactant. The rate is the same in the presence of chloride ion as in the presence of perchlorate ion. The rate decreases with increasing acidity. The results indicate that electron-transfer can occur over very great distances in aqueous media by a water-bridging mechanism.
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