ABSTRACT

This paper reports the thermal, thermodynamic, thermophysical and surface properties of eight ionic liquids with fluorinated alkyl side chain lengths equal or greater than four carbon atoms. Melting and decomposition temperatures were determined together with experimental densities, surface tensions, refractive indices, dynamic viscosities and ionic conductivities in a temperature interval ranging from (293.15 to 353.15) K. The surface properties of these fluorinated ionic liquids were discussed and several thermodynamic functions, as well as critical temperatures, were estimated. Coefficients of isobaric thermal expansion, molecular volumes and free volume effects were calculated from experimental values of density and refractive index and compared with previous data. Finally, Walden plots were used to evaluate the ionicity of the investigated ionic liquids.

Compounds

#	Formula	Name
1	C24H36F17NO3S	tetrabutylammonium heptadecafluorooctanesulfonate
2	C20H36F9NO3S	tetrabutylammonium perfluorobutanesulfonate
3	C12H12F9NO3S	1-ethyl-3-methylpyridinium perfluorobutanesulfonate
4	C9H14F9NO4S	cholinium perfluorobutanesulfonate
5	C13H14F18N2O5S2	cholinium bis(nonafluorobutylsulfonyl)imide
6	C15H16F18N2O4S2	1-ethyl-1-methylpyrrolidinium bis(nonafluorobutylsulfonyl)imide
7	C17H20F18N2O4S2	1-butyl-1-methylpyrrolidinium bis(nonafluorobutylsulfonyl)imide
8	C13H12F9NO2	1-ethyl-3-methylpyridinium perfluoropentanoate

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	Constraint	Phase	Method	#Points
POMD	1	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	5
POMD	3	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	4	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	5	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	5	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	5
POMD	5	Mass density, kg/m3 ; Metastable liquid	Temperature, K; Metastable liquid	Pressure, kPa; Metastable liquid	Metastable liquid	Vibrating tube method	10
POMD	5	Viscosity, Pa*s ; Metastable liquid	Temperature, K; Metastable liquid	Pressure, kPa; Metastable liquid	Metastable liquid	Concentric cylinders viscometry	10
POMD	5	Refractive index (Na D-line) ; Metastable liquid	Temperature, K; Metastable liquid	Pressure, kPa; Metastable liquid	Metastable liquid	Standard Abbe refractometry	10
POMD	5	Electrical conductivity, S/m ; Metastable liquid	Temperature, K; Metastable liquid	Pressure, kPa; Metastable liquid	Metastable liquid	Alternating current cell with electrodes	4
POMD	6	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	7	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	8	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	8	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	13
POMD	8	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	13
POMD	8	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	13
POMD	8	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	7

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Fluorination effects on the thermodynamic, thermophysical and surface properties of ionic liquids

Vieira, N. S. M., Luis, A., Reis, P. M., Carvalho, P. J., Lopes-da-Silva, J. A., Esperanca, J. M. S. S., Araujo, J. M. M., Rebelo, L. P. N., Freire, M. G., Pereiro, A. B.

ABSTRACT