Synthetic aza macrocycles are well-known for their binding properties toward either inorganic1 or organic2 cations, anions: and neutral molecules? Selective binding of certain cations by multifunctional aza macrocycles has resulted in their use as models for carrier molecules in the study of active ion transport phenomena in liquid membrane~ ystems.~ Furthermore, macrocyclic (po1y) amines have been further functionalized to improve ...