MOLECULAR RECOGNITION WITH LANTHANIDE COMPLEX-TYPE RECEPTOR - A REVIEW

Lipophilic lanthanide complexes acted as effective receptors of inorga nic/organic anions, zwitterionic amino acids and other water-soluble g uests under neutral conditions. They were electrically neutralized but formed highly coordinated 1:1 complexes with various guests. FAB-MS, NMR and CD spectroscopic studies as well as extraction and liquid memb rane transport experiments revealed that they exhibited largely differ ent receptor functions from common receptors: Lanthanide tris(beta-dik etonates) effectively transported hydrophilic Cl- anion and zwitterion ic amino acids; Chiral ytterbium complex offered enantioselective extr action of amino acids; and achiral gadolinium-porphyrin acted as a uni que CD probe for chirality determination of amino acids.