Complexation and transfer free energies of metal-ion dibenzocryptates

Abstract

Stability constants of dibenzocryptand-222 and alkali-metal and silver cations in N,N-dimethylformamide, dimethyl sulphoxide, acetonitrile, propylene carbonate and nitromethane and derived free energies of complexing at 298 K are reported. The results obtained in the five dipolar aprotic solvents lend support to the linear correlation previously reported between the single-ion thermodynamic parameters of transfer among the dipolar aprotic solvents based on the Ph4AsPh4B convention and the differences between the thermodynamic parameters for the complexation reaction of metal-ion cryptates in these solvents.