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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Solvation of ions. XXVI. Free energies of transfer of ions to multi-site solvents and solvent mixtures

AJ Parker and WE Waghorne

Australian Journal of Chemistry 31(6) 1181 - 1187
Published: 1978

Abstract

The free energies of solvent transfer of Ag+, K+, Cl-, Br-, I- and ClO4- from acetonitrile to glycolonitrile, 3-hydroxypropionitrile and mixtures of 2,2,2-trifluoroethanol or water with acetonitrile are reported.    

The anion-solvating properties of a series of hydroxylic solvents decrease by 24 kJ mol-1 in the order CF3CH2OH > CNCH2OH > CNCH2CH2OH > CH3OH > CH3CH2OH; Ag+-solvating properties decrease by 70 kJ mol-1 in the order CH3CN > HOCH2CH2CN > HOCH2CN > CH3CH2OH > CF3CH2OH; and the K+- solvating properties decrease by 27 kJ mol-1 in the order CH3CN > HOCH2CH2CN ≈ CH3OH ≈ HOCH2CN ≈ CH3CH2OH > CF3CH2OH.

It is not possible to make more than qualitative generalizations as to the ion-solvating properties of solvent mixtures if only the solvating properties of the pure components are known. Multi-site solvents like CNCH2OH are compared with related equimolar mixtures, like CH3CN/HOH, in their ability to solvate ions.

https://doi.org/10.1071/CH9781181

© CSIRO 1978

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