ABSTRACT

Densities of some aqueous ionic liquids containing alkyl sulfate anions, 1-ethyl-3-methylimidazolium methyl sulfate, 1-hexyl-3-methylimidazolium methyl sulfate, and 1-hexyl-3-methylimidazolium ethyl sulfate solutions were measured at T = (298.15-328.15) K and at atmospheric pressure. The apparent molar volumes at infinite dilution were found by extrapolation to infinite dilution with using Redlich-Mayer and Pitzer equations. The apparent molar volumes at infinite dilution were used to obtain information about solute.solvent and solute-solute interactions. The temperature dependence of apparent molar volumes were used to calculation of apparent molar expansivities and the Hepler fs constant values. The Hepler fs constant values were found very small negative which indicating the ionic liquids under study are predominantly a structure breaker due to hydrophobic hydration of ionic liquids in water. The results were discussed in terms of alkyl chain length and anion size on the volumetric properties on the studied ionic liquids.

Compounds

#	Formula	Name
1	H2O	water
2	C7H14N2O4S	1-ethyl-3-methylimidazolium methylsulfate
3	C11H22N2O4S	1-hexyl-3-methylimidazolium methyl sulfate
4	C12H24N2O4S	1-hexyl-3-methylimidazolium ethyl sulfate

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	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	4
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	4
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	4	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	4
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	56
POMD	1 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	56
POMD	1 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	56

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Apparent molar volumes and expansivities of aqueous solutions of ionic liquids, 1-alkyl-3-methylimidazolium alkyl sulfate at T = (298.15-328.15) K

Shekaari, H.[Hemayat], Armanfar, E.[Elnaz]

ABSTRACT