TRANSPORT STUDIES OF INORGANIC AND ORGANIC CATIONS ACROSS LIQUID MEMBRANES CONTAINING MANNICH-BASE CALIX[4]RESORCINARENES

Three calix[4]resorcinarenes, two of them incorporating Mannich-type a mino functions (C2 and C3), have been studied in respect to their iono selectivities towards inorganic alkali cations as well as for organic primary ammonium cations, by ion transport across the bulk liquid memb rane and extraction experiments. The ligand C3 displayed particular io noselectivity for lithium ion, as a carrier in toluene membrane. The d iscrimination of organic primary ammonium ions was remarkable in liqui d membranes, and the pattern of this discrimination depended on the me mbrane composition. Selectivities for both inorganic and organic ions depended significantly on the membrane composition, the substituent in the calix [4]resorcinarene, and the counterion present in the salts s tudied.