ABSTRACT

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 the change in heat capacity from liquid to gas required for the extrapolation of experimental vaporization enthalpies to the reference temperature 298 K has been discussed.

Compounds

#	Formula	Name
1	C10H15F6N3O4S2	1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
2	C12H19F6N3O4S2	1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
3	C14H23F6N3O4S2	1-octyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
4	C16H27F6N3O4S2	1-decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide
5	C18H31F6N3O4S2	1-dodecyl-3-methyl-1H-imidazolium bis(trifluoromethylsulfonyl)amide
6	C20H35F6N3O4S2	1-tetradecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
7	C22H39F6N3O4S2	3-hexadecyl-1-methyl-1H-imidazolium bis((trifluoromethyl)sulfonyl)amide
8	C24H43F6N3O4S2	3-methyl-1-octadecyl-1H-imidazolium bis((trifluoromethyl)sulfonyl)amide

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	2	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	3	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	4	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	5	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	6	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	7	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1
POMD	8	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Thermogravimetric Analysis	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Vaporization enthalpies of imidazolium based ionic liquids. A thermogravimetric study of the alkyl chain length dependence

Verevkin, S. P.[Sergey P.], Zaitsau, D. H.[Dzmitry H.], Emel'yanenko, V. N.[Vladimir N.], Ralys, R. V.[Ricardas V.], Yermalayeu, A. V.[Andrei V.], Schick, C.[Christoph]

ABSTRACT