ABSTRACT

In this work, the effect of the alkyl chain size in 1-ethylpyridinium cation-based ionic liquids are used to explore the nanostructuration effect. Densities and viscosities and their dependence on temperature were measured for the 2-alkyl-1-ethylpyridinium bis(trifluoromethanesulfonyl)imide, [2CN-2 1C2Py][NTf2] (N=4, 5, 6, 7, 8, 9, 10) ionic liquid series. Molar volume, thermal expansion coefficients, VFT parameters, as well as, the energy barrier related to the fluid shear at T = 298.15 K, were derived. Highly precise measurements of the heat capacities, at T = 298.15 K, were performed using a drop calorimeter. In agreement with the previously studies based on the alkylimidazolium ionic liquids series, the studied thermophysical and transport properties of the series presents an indication that in the pyridinium based ionic liquids the nanostructuration is intensified after a critical alkyl length, [2C5 1C2Py][NTf2]. The observed trend shift in the viscosity and heat capacities of the pyridinium ionic liquids is more pronounced in the pyridinium than in the imidazolium ionic liquids series.

Compounds

#	Formula	Name
1	C11H14F6N2O4S2	1,2-diethylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
2	C12H16F6N2O4S2	1-ethyl-2-propylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
3	C13H18F6N2O4S2	2-butyl-1-ethylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
4	C14H20F6N2O4S2	1-ethyl-2-pentylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
5	C15H22F6N2O4S2	1-ethyl-2-hexylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
6	C16H24F6N2O4S2	1-ethyl-2-heptylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
7	C17H26F6N2O4S2	1-ethyl-2-octylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
8	C18H28F6N2O4S2	1-ethyl-2-nonylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide
9	C19H30F6N2O4S2	2-decyl-1-ethylpyridin-1-ium bis((trifluoromethyl)sulfonyl)imide

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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	6	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	7	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	15
POMD	7	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Concentric cylinders viscometry	15
POMD	8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1
POMD	9	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Drop calorimetry	1

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Physicochemical properties of 2-alkyl-1-ethylpyridinium based ionic liquids

Rocha, M. A. A.[Marisa A. A.], Vilas, M.[Miguel], Rodrigues, A. S. M. C.[Ana S. M. C.], Tojo, E.[Emilia], Santos, L. M. N. B. F.[Luis M. N. B. F.]

ABSTRACT