Equilibria between Ag+ and aza-crown ethers

Complex-formation equilibria of silver(I) ions and aza-crown ethers and ali phatic amines were studied in acetonitrile, propylene carbonate, and methan ol by the potentiometric method. It was found that AgL+ and AgL2+ species ( L denoting the organic ligand) are formed. The stability constants of the c omplexes with crown ethers are greater compared to those with amines. It wa s found that solvent composition and cavity size of macrocyclic polyethers influence significantly the stability constants of the complexes formed. Th e difference in stability constants for various crown polyethers is discuss ed in terms of possible structure of the complexes.