Abstract
Some calix[4]arenes were found to form complexes with solvent molecules which retained their stoichiometric composition when sublimed. Saturated vapor pressures of calix[4]arenes and their complexes with solvents were for the first time determined by the Knudsen effusion method over a wide temperature range. Changes in the standard thermodynamic parameters of complex formation in the transfer from the condensed to gas phase were calculated. The enthalpy contribution to the Gibbs energy grew as conformational ligand mobility increased, and the entropy contribution increased as flexibility decreased and rigidity increased.
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