THE COMPLEXATION OF ALKALINE CATIONS BY CROWN-ETHERS AND CRYPTANDS INACETONE

Stability constants and thermodynamic values for the complex formation of alkali ions by crown ethers, diaza crown ethers and cryptands have been measured by means of potentiometric and calorimetric titrations in acetone as solvent. The interactions between the ligands and solven t molecules play an important role for the complex formation. Cryptand s form the most stable complexes with alkali ions if inclusion complex es are formed. Even in the case that the salts are not completely diss ociated in acetone the presence of ion pairs does not influence the ca lculated values of the stability constants.