A.C. impedance study of rate constants for two-phase electron-transfer reactions
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 89 (2) , 199-205
- https://doi.org/10.1039/ft9938900199
Abstract
The a.c. impedance technique has been used for the measurement of electron-transfer rate constants between organic and inorganic redox couples at the water/1,2-dichloroethane interface. The organic compounds studied were lutetium diphthalocyanine, bis(pyridine)(meso-tetraphenylporphyrinato)ruthenium(II) and 7,7,8,8-tetra-cyanoquinodimethane; Fe(CN)3–/4– 6 was in all cases the aqueous redox couple. Electron-transfer rate constants were calculated using recent theoretical developments based on a continuum media model. It is concluded that Marcus theory can be used to predict the rate constants for two-phase reactions. Potential-dependent transfer coefficients have been found and it is shown that the origin of this effect is ionic adsorption in the form of interfacial ion pairing.Keywords
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