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Vaporization Enthalpies of Imidazolium Based Ionic Liquids: Dependence on Alkyl Chain Length
Author(s) -
Zaitsau Dzmitry H.,
Verevkin Sergey P.,
Emel'yanenko Vladimir N.,
Heintz Andreas
Publication year - 2011
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201100618
Subject(s) - vaporization , ionic liquid , quartz crystal microbalance , alkyl , imide , chemistry , enthalpy of vaporization , ionic bonding , analytical chemistry (journal) , enthalpy , organic chemistry , ion , thermodynamics , adsorption , catalysis , physics
Abstract Vaporization enthalpies of a series of ten 1‐alkyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquids (ILs) [C n mim][NTf 2 ] with alkyl chain lengths of n =2, 3, 4, 6, 8, 10, 12, 14, 16, and 18 are determined by using a recently developed quartz crystal microbalance method. Due to the high sensitivity of the microbalance vapor studies can be extended to temperatures 60–100 K lower than those available with other methods. The results reveal a remarkably linear dependence of the vaporization enthalpies on the chain length at the reference temperature of 298 K.