Abstract
The valinomycin-mediated transfer of potassium ions across the water/nitrobenzene interface was studied by potential-sweep voltammetry at this interface (ITIES). With a sweep rate 16.3 mV s −1 and at low concentrations of valinomycin reversible peak voltammograms were obtained. The charge transfer process is controlled by diffusion of valinomycin to ITIES and of the complex from ITIES into the bulk of the organic phase. The formation and the dissociation of the complex are rapid surface reactions. From the peak potential the stability constant of the valinomycin-potassium complex log K KV + =5.5 was determined.
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