Abstract
Transfer of Li +, Na +, K +, Rb +,Ca 2+, Sr 2+, and B a2+ ions facilitated by hexa- and octaethylene glycol monododecyl ethers (C12E6 and C12E8) has been studied at the nitrobenzene (NB)-water (W) interface using cyclic voltammetry. When the concentration of C12E n ( n = 6 or 8) in NB is higher than 1 mM, cyclic voltammograms for all these ions show reversible transfer of ions facilitated by C12E n. The current is mainly carried by 1:1 (metal:ligand) complex and is limited by the diffusion of C12E n in N B. When the concentration of C12E n in NB is lowered to the submillimolar range, the contribution of the adsorption of C12E n to the current becomes significant. In the transfer of hydrophilic ions, e.g., Li + and Ca 2+, the contribution of the complex with 1:2 (metal:ligand) stoichiometry to the measured current becomes nonnegligible. This 1:2 complex formation becomes pronounced with increasing ligand concentration.
Published Version
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