Ac impedance analysis of tetraethylammonium ion transfer at liquid/liquid microinterfaces

Abstract

The kinetics of ion transfer reactions at the microhole-supported water/nitrobenzene interface have been studied by an ac impedance technique. A thin layer approximation of diffusional impedance has been derived for the geometry of the hole. In contrast to the large-area interface, the charge transfer resistance at the liquid microinterface is comparable in magnitude with the electrolyte resistance, which makes its determination more reliable. The apparent rate constant of tetraethylammonium ion transfer, k_app= 0.22 cm s^–1, as determined at the liquid microinterface with an area ranging from 100 to 1000 µm², has been found to be about twice as high as that previously reported.