The enthalpies of vaporisation of ionic liquids: new measurements and predictions

文献情報

出版日 2012-01-06

DOI 10.1039/C2CP23705A

インパクトファクター 3.676

著者

Alexey Deyko, Stephen G. Hessey, Peter Licence, Elena A. Chernikova, Vladimir G. Krasovskiy, Leonid M. Kustov, Robert G. Jones

原文を見る

要旨

The enthalpies of vaporisation, ΔvapH298, of seven ionic liquids (ILs) (four imidazoliums, a pyridinium, a phosphonium and an isouronium) have been determined by temperature programmed desorption using line of sight mass spectrometry. They were: 1-ethyl-3-methylimidazolium bis(pentafluoroethyl)phosphinate, [C2C1Im][PO2(C2F5)2]; 1-butyl-3-methylimidazolium octylsulfate, [C4C1Im][C8OSO3]; 1-butyl-3-methylimidazolium tetrafluoroborate, [C4C1Im][BF4]; 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate, [C6C1Im][FAP]; 1-butylpyridinium methylsulfate, [C4Py][C1OSO3]; trihexyl(tetradecyl)phosphonium tetrafluoroborate, [P6,6,6,14][BF4] and O-ethyl-N,N,N′,N′-tetramethylisouronium trifluoromethanesulfonate, [C2(C1)4iU][TfO]. The values were found to be consistent with a previously proposed, predictive, model in which ΔvapH298 is decomposed into a Coulombic component (computable from the IL density) and van der Waals components from the anion and cation. Two previously predicted values of ΔvapH298 were found to be within 6 kJ mol−1 of the measured experimental values. Values for the van der Waals components are tabulated for eleven cations and twelve anions. Predictions are made for ΔvapH298 for 13 ILs with as yet unmeasured ΔvapH298 values (using experimental molar volumes), and for a further 44 ILs using estimated molar volumes.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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