ABSTRACT

In this work, four 1-butyl-3-methylimidazolium carboxylate ionic liquids (ILs) with different substituent groups in anions, including 1-butyl-3-methylimidazolium glycollate [C4mim][HOCH2COO], 1-butyl-3-methylimidazolium lactate [C4mim][CH3CHOHCOO], 1-butyl-3-methylimidazolium benzoate [C4mim][C6H5COO], and 1-butyl-3-methylimidazolium glycinate [C4mim][H2NCH2COO], have been synthesized and characterized. Their densities (?) and surface tensions (?) have been determined experimentally in the temperature range of (298.15 to 343.15) K. By using thermodynamic and empirical equations, molar volume (Vm), isobaric expansivity (ap), standard entropy (Sdeg ), lattice energy (UPOT), surface excess entropy (Ss), vaporization enthalpy (?lgHm0) and Hildebrand solubility parameter (dH) of these ILs have been derived from density and surface tension data. The effects of substituent groups in carboxylate anions on densities and surface tensions of these ILs have been assessed from the analysis of the structure property relationship.

Compounds

#	Formula	Name
1	C11H20N2O3	1-butyl-3-methylimidazolium lactate
2	C15H20N2O2	3-butyl-1-methylimidazolium benzoate
3	C10H18N2O3	1-butyl-3-methylimidazolium glycolate
4	C10H19N3O2	1-butyl-3-methylimidazolium glycinate

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	1	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	3	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	4	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Air at 1 atmosphere	Pendant drop shape	6

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

Effect of Substituent Groups in Anions on Some Physicochemical Properties of 1-Butyl-3-methylimidazolium Carboxylate Ionic Liquids

Xu, A.[Airong], Zhang, Y.[Yajuan], Li, Z.[Zhiyong], Wang, J.[Jianji]

ABSTRACT