کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
215698 | 1426259 | 2012 | 5 صفحه PDF | دانلود رایگان |
Vaporization enthalpies for a series of ten ionic liquids (ILs) 1-alkyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imide [Cnmim][NTf2], with the alkyl chain length n = 4, 6, 8, 10, 12, 14, 16, and 18 were determined using the thermogravimetric method. An internally consistent set of experimental data and vaporization enthalpies at 540 K was obtained. Vaporization enthalpies at 540 K have shown a linear dependence on the chain length of the alkyl-imidazolium cation in agreement with the experimental results measured previously with a quartz crystal microbalance. Ambiguity of ΔlgCp mo-values required for the extrapolation of experimental vaporization enthalpies to the reference temperature 298 K has been discussed.
► Enthalpies of vaporization of ionic liquids were measured with thermogravimetry.
► We studied 1-alkyl-3-methyl-imidazolium bis(trifluoromethanesulfonyl)imide.
► The linear alkyl chain length was 4, 6, 8, 10, 12, 14, 16, and 18 C-atoms.
► A linear dependence on the chain length of the alkyl-imidazolium cation was found.
Journal: The Journal of Chemical Thermodynamics - Volume 54, November 2012, Pages 433–437