Complexation of some amine compounds by macrocyclic receptors

Some aspects of complex formation, liquid-liquid extraction, and transport through liquid membrane of various amine compounds like ammonium ion, amines, amino acids and peptides, with macrocyclic receptors, such as crown ethers, cryptands, calixarenes, and cucurbituril are presented. Log K, DeltaH, and T DeltaS data are reported for reaction of some representative complexes of the amine compounds by macrocyclic receptors obtained from different techniques such as calorimetric and potentiometric titrations, or spectrophotometric methods in various solvents. Solvent extraction and transport of these complexes through bulk liquid membranes are also studied. Based on these studies, the effect of some factors that might influence the complex formation, the extraction, and the transport through liquid membranes are discussed.