Selective Transport of Potassium Ions against Their Concentration Gradient by Pentaethylene Glycol Derivative Containing Both 8-Quinolyl and o-Carboxylphenyl Terminal Groups

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Abstract
A pentaethylene glycol derivative containing both 8-quinolyl and o-carboxylphenyl terminal groups can transport potassium ions selectively against the concentration gradient in liquid membrane systems containing more than one alkali ion species in aqueous solution. Uptake of cations by this synthetic ionophore from the aqueous solution into the organic layer is confirmed to be important for exhibiting this excellent selectivity toward potassium ions.