Potentiometric and AM1d studies of the equilibria between silver(I) and monoaza, diaza, triaza and tetraaza-12-crown ethers in acetonitrile and propylene carbonate

Abstract

Complex formation and stability constants between monoaza, diaza, triaza and tetraaza-12-crown ethers with silver(I) were determined in acetonitrile and propylene carbonate by the potentiometric method. Complexes of 1 : 1 and 1 : 2 metal-to-ligand stoichiometry were formed. The solvent composition and number of nitrogens significantly influence the stability constants of the complexes formed. The energetically most favorable structures of the 1 : 1 metal-to-ligand complexes were calculated and visualized by the AM1d method at the semi-empirical level of theory.

Keywords:

• Azacrown ethers
• Equilibrium
• Silver(I)

Acknowledgements

The authors gratefully acknowledge the financial support from Grant DS/8210-4-0177-13 from the University of Gdansk and KBN NN204 122640.