Thermodynamic characteristics of alanine-18-crown-6 ether complexes in binary water-acetone solvents |
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| Authors: | T R Usacheva I A Kuz’mina V A Sharnin I V Chernov E Matteoli |
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| Institution: | 1.Ivanovo State University of Chemistry and Technology,Ivanovo,Russia;2.Institute for Physico-Chemical Processes of National Research Council,IPCF-CNR,Pisa,Italy |
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| Abstract: | The formation of 18-crown-6 ether (18C6) complexes with D,L-alanine (Ala) in mixed wateracetone solvents with 0.0, 0.08, 0.17,
0.22, and 0.30 mole fractions of acetone (T = 298.15 K) was investigated by means of calorimetry. Thermodynamic characteristics of the reaction of the molecular Ala18C6]
complex formation (Δr
G°, Δr
H°, and TΔr
S°) were calculated on the basis of calorimetric data. Analysis of solvation contributions of reagents into the enthalpy of
the Ala18C6] formation reaction showed that the changes in the reaction energy when the solvent composition is varied are
determined by the changes in the solvate state of 18C6. |
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| Keywords: | |
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