ABSTRACT

Experimental density measurements are reported, and the derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, and the thermal pressure coefficient are presented as Supporting Information for several imidazolium-based ionic liquids (ILs), namely, 1-ethyl-3-methyl-imidazolium bis- (trifluoromethylsulfonyl)imide [C2mim][NTf2], 1-heptyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C7mim][NTf2], 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide [C8mim][NTf2], 1-ethyl-3-methylimidazolium tetrafluoroborate [C2mim][BF4], and 1-butyl-3-methyl-imidazolium tricyanomethane [C4mim][C(CN)3] in the pressure (0.10 less than p/MPa less than 30.00) and temperature (293.15 less than T/K less than 393.15) domains. These ILs were chosen to provide an understanding of the influence of the cation alkyl chain length and the anion influence on the properties under study. Experimental densities are correlated with the Tait equation with an average absolute deviation (AAD) less than 0.04 %. Experimental densities are in good agreement with the densities obtained by some recent predictive methods proposed in the literature.

Compounds

#	Formula	Name
1	C14H23F6N3O4S2	1-octyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
2	C6H11BF4N2	1-ethyl-3-methylimidazolium tetrafluoroborate
3	C12H15N5	1-butyl-3-methylimidazolium tricyanomethane
4	C8H11F6N3O4S2	1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
5	C13H21F6N3O4S2	1-heptyl-3-methylimidazolium bis(trifluoromethylsulfonyl)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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	96
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	96
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	96
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	96
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:8	96

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

P-rho-T Measurements of Imidazolium-Based Ionic Liquids

Gardas, R. L.[Ramesh L.], Freire, M. G.[Mara G.], Carvalho, P. J.[Pedro J.], Marrucho, I. M.[Isabel M.], Fonseca, I. M. A.[Isabel M. A.], Ferreira, A. G. M.[Abel G. M.], Coutinho, J. A. P.[Joao A. P.]

ABSTRACT