Sodium and potassium cation were actively transported in opposite directions across a dichloromethane membrane by a novel bis(crown ether), which has a structure consisting of 15-crown-5 and monoaza-18-crown-6 linked by two oxyethylene units.
Y. Nakatsuji, M. Sakamoto and M. Okahara, J. Chem. Soc., Chem. Commun., 1988, 1101 DOI: 10.1039/C39880001101
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