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E. Balantseva, J. K. Lehmann, Andreas Heintz

Enthalpies of Solution of Organic Solutes in the Ionic Liquids [Me₃BuN][NTf₂] and [EMIM][EtSO₄]

Keywords: Ionic Liquids, Partial Molar Enthalpies, Titration Calorimetry, Thermodynamics

Partial molar enthalpies of solution of 11 systems [Me₃BuN][NTf₂] + methanol, + ethanol, + 1-propanol, + 1-butanol, + benzene and [EMIM][EtSO₄] + methanol, + ethanol, + 1-propanol, + 1-butanol, + CHCl₃, + H₂O have been measured at 298.15 K in the mole fraction range 1% to 25% of the solutes using a precision titration calorimeter (Thermal Activity Monitor 2277, Thermometrics). The experimental results have been extrapolated to infinite dilution of the solutes in the ionic liquids. The partial molar enthalpies of solution at infinite dilution H_i,∞^E obtained by this method have been compared with values derived from the temperature dependence of the activity coefficients at infinite dilution γ_i,∞ which have been obtained by a gaschromatographic technique already published previously. Not for all systems studied agreement has been found within the experimental error limits of both methods indicating thermodynamic consistency of the results.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 220, 10/2006
Pages: 1499 - 1505

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