Effects of potassium ion on the electron-transfer reaction between Fe(CN)64− and TCNQ or chloranil

15 August 1978

journal article
Published by Canadian Science Publishing in Canadian Journal of Chemistry

Vol. 56 (16) , 2216-2220
https://doi.org/10.1139/v78-363

Abstract

The effects of potassium ion on the electron-transfer reactions between Fe(CN)64− and 7,7,8,8-tetracyanoquinodimethane (TCNQ) or chloranil (QCl4) were studied with temperature-jump equipment; [Formula: see text]. The solvent was a 1:1 (v/v) mixture of acetonitrile–water. In both Systems, the forward rate constants (kr) were unaffected by the addition of KCl; kf(Fe(CN)64−/TCNQ) = (2.9 ± 0.2) × 106 M−1 s−1, and kr(Fe(CN)64−/QCl4) = (5.2 ± 0.4) × 104 M−1 s−1 On the other hand, the backward rate constants (kb) increased with the increase of the KCl concentration. The results are interpreted in terms of ion-pairing equilibria of Fe(CN)64− and Fe(CN)63−.

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