Articles Special Issue · Ionic Liquid and Green Chemistry

Science China Chemistry

, Volume 55, Issue 8, pp 1525-1531

First online:

Structure-property relationships in ILs: A study of the alkyl chain length dependence in vaporisation enthalpies of pyridinium based ionic liquids

  • Dzmitry H. ZaitsauAffiliated withDepartment of Physical Chemistry, University of Rostock
  • , Andrei V. YermalayeuAffiliated withDepartment of Physical Chemistry, University of Rostock
  • , Vladimir N. Emel’yanenkoAffiliated withDepartment of Physical Chemistry, University of Rostock
  • , Sergey P. VerevkinAffiliated withDepartment of Physical Chemistry, University of Rostock Email author 
  • , Urs Welz-BiermannAffiliated withEvonik Degussa Taiwan Ltd.
  • , Thomas SchubertAffiliated withIoLiTec Ionic Liquids Technologies GmbH

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Abstract

The enthalpies of vaporization for the series of pyridinium-based ionic liquids with bis(trifluoromethylsulfonyl)imide anion [C n Py][NTf2] (n = 2, 3, 4, 5, and 6) have been determined with the quartz crystal microbalance technique combined with the Langmuir evaporation. The linear dependence of vaporization enthalpies on the chain length has been revealed. New approach based on volumetric, surface tension, and speed of sound measurements has been developed for estimation of heat capacity differences between gas and liquid phase, which were required for adjustment of measured vaporization enthalpies to the reference temperature 298 K.

Keywords

ionic liquids enthalpy of vaporization quartz crystal microbalance structure-property relations