Solvation of ions. XXVI. Free energies of transfer of ions to multi-site solvents and solvent mixtures
Parker, A.J. and Waghorne, W.E. (1978) Solvation of ions. XXVI. Free energies of transfer of ions to multi-site solvents and solvent mixtures. Australian Journal of Chemistry, 31 (6). pp. 1181-1187.
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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.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Mathematical and Physical Sciences|
|Publisher:||Commonwealth Scientific and Industrial Research Organization Publishing|
|Copyright:||© 1978 CSIRO|
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