Effect of solvation on the thermodynamics of the formation of molecular complexes of 18-crown-6 ether with glycine in water-dimethylsulfoxide solutions |
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| Authors: | T R Usacheva V A Sharnin E Matteoli |
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| Institution: | 1.Ivanovo State University of Chemistry and Technology,Ivanovo,Russia;2.Institute of Physical and Chemical Processes,National Research Council of Italy,Pisa,Italy |
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| Abstract: | Complexation of the 18-crown-6 ether (18C6) with glycine (Gly) in mixed H2O-DMSO solvents with the composition of 0.1, 0.2, and 0.25 mole fraction of DMSO (T = 298.15 K) was studied calorimetrically. Thermodynamic characteristics of the reaction of the formation of the molecular
Gly18C6 complex (Δr
G°, Δr
H°, TΔr
S°) were calculated from the calorimetric data. It was established that the change in the stability of the Gly18C6 complex
is mainly determined by the predominance of the enthalpy component of the Gibbs energy over the entropy component. It was
shown during the analysis of the enthalpy contributions of the reagents to the enthalpy of the reaction of the formation of
Gly18C6 that the change in the enthalpy of the reaction upon a change the solvent composition was due to changes in the solvation
state of 18C6. |
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| Keywords: | |
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