Facilitated Ion Transfer Across the Micro-liquid/Liquid Interface Supported at the Tip of a Silanized Micropipette

摘要

Glass micropipettes with silanized inner walls can be filled with an organic solvent for voltammetric measurements in an aqueous solution. This arrangement was employed to investigate systematically the mechanism of facilitated potassium ion transfer by an ionophore dibenzo-18-crown-6(DB18C6) across a micro-water/1.2-dichloroethane(W/DCE) interface supported at the tip of a silanized mieropipette. Our experimental results verify that this facilitated ion transfer across the liquid/liquid interface did occur by an interfacial com-plexation-dissociation process(T1C-TID mechanism). The ratio of the diffusion coefficient of DB18C6 to that of its complexcd ion in the DCE phase was calculated to be 1. 74 +- 0. 07.