Double-layer dynamics in the adsorption of tetrabutylammonium ions at the mercury | water interface Part 4. The reduction of hexammine-cobalt(III) through tetrabutylammonium films |
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Authors: | Thomas Wandlowski Robert de Levie |
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Abstract: | The reduction of hexamminecobalt(III) at the mercury-water interface is strongly affected by the presence of a condensed tetrabutylammonium film. When the anions present are fluoride and/or tetrafluoroborate, electron transfer through the film proceeds via an inner-sphere mechanism, i.e. the film must be opened so that hexamminecobalt(III) can make direct contact with the metal. In the presence of bromide anions, an outer-sphere pathway is indicated, probably involving bridging by bromide ions. Unusual current-time transients of the reduction of hexamminecobalt(III) in the presence of tetrabutylammonium ions are correlated with the kinetics of film formation. |
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Keywords: | Electroreduction Interfacial chemistry |
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