Abstract
The transfer behaviour of alkali metal ions across the water-nitrobenzene interface facilitated by nonionic surfactants poly(oxyethylene)dodecyl ethers (C 12E x ) were investigated by means of cyclic voltammetry. The results show a linear dependence of the reversible half-wave potential Δ w nφ 1/2 on the logarithm of the concentration of alkali metal ions in the aqueous phase. Therefrom, the apparent free energy change of ion transfer facilitated by C 12E x , ‡ w n G 0 tr, was determined. The results indicate that the ion transfer facilitated by C 12E x is attributable to the formation of a hydrophobic complex of alkali metal ion with C 12E x and its ion pairs with the counter anion, and the rate of transfer is controlled by the diffusion of C 12E x from the bulk nitrobenzene phase to the interface.
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