LIQUID MEMBRANE-TRANSPORT OF SUPRAMOLECULAR COMPLEXES OF SOME AMINES AND AMINO-ACIDS WITH MACROCYCLIC LIGANDS

The transport of some amines in protonated form was studied (viz. meth ylamine, dimethylamine, diethylamine and n-propylamine) and cu-amino a cids (L-leucine, L-methionine, L-isoleucine, L-phenylalanine, L-valine , L-cy-alanine and L-cysteine). The following macrocyclic ligands were used as carriers throughout the experiments: 15-crown-5 (15C5), 18-cr own-6 (18C6), benzo-18-crown-6 (B18C6), dibenzo-18-crown-6 (DB18C6), d iazacrown ether [2.2] (1,7,10,16-tetraoxa-4,13-diazacyclooctadecane) a nd cryptand [2.2.2] (4,7,13,16,21,24-hexaoxa-1, 10-diazabicyclo [8.8.8 ] hexacosane). The active transport, assisted by pH gradient, of amino acids and amines in protonated form as ion pairs in the presence of p icrate anion was performed. The experiments suggested the influence of the ligand size, the donor atom type, and the substituents on the tra nsport phenomena.