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

作　　者：ZAITSAU Dzmitry H. YERMALAYEU Andrei V. EMEL'YANENKO Vladimir N. VEREVKIN Sergey P. WELZ-BIERMANN Urs SCHUBERT Thomas 

机构地区：[1]Department of Physical Chemistry, University of Rostock, Dr-Lorenz-Weg 1, D-18059, Rostock, Germany [2]Evonik Degussa Taiwan Ltd., 133, Minsheng East Road, Section [3]Taipei 10596, China 3IoLiTec Ionic Liquids Technologies GmbH, Salzstrasse 184, 74076 Heilbronn, Germany

出　　处：《Science China Chemistry》2012年第8期1525-1531,1-6,共7页中国科学（化学英文版）

基　　金：supported by the German Science Foundation (DFG) in frame of the priority program SPP 1191 "Ionic Liquids" (VE 265/5-3)

摘　　要：The enthalpies of vaporization for the series of pyridinium-based ionic liquids with bis（trifluoromethylsulfonyl）imide anion [CnPy][NTfz] （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 ref- erence temperature 298 K.The enthalpies of vaporization for the series of pyridinium-based ionic liquids with bis(trifluoromethylsulfonyl)imide anion [CnPy][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 ref- erence temperature 298 K.

关 键 词：ionic liquids enthalpy of vaporization quartz crystal microbalance structure-property relations 

分 类 号：O621.2[理学—有机化学]