ABSTRACT

The amino acid ionic liquids (AAILs) [C3mim][Gly] (1-propyl-3-methylimidazolium glycine) and [C4mim][Gly] (1-butyl-3-methylimidazolium glycine) have been prepared by the neutralization method and characterized by 1H NMR spectroscopy and differential scanning calorimetry (DSC). The values of their density, surface tension and refractive index were measured at different temperatures. Since the AAILs can form strong hydrogen bonds with water, small amounts of water are difficult to remove from the AAILs by common methods. In order to eliminate the effect of the impurity as water, the standard addition method (SAM) was applied to these measurements. The values of thermal expansion coefficients, surface excess energy, surface excess entropy and molar refraction for the AAILs were determined.

Compounds

#	Formula	Name
1	H2O	water
2	C9H17N3O2	1-propyl-3-methylimidazolium glycine
3	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	2	Triple point temperature, K ; Glass			Glass Liquid Air at 1 atmosphere	DTA	1
POMD	2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Gas	Maximal bubble pressure	10
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	7
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Buoyancy - hydrostatic balance	10
POMD	3	Triple point temperature, K ; Glass			Glass Liquid Air at 1 atmosphere	DTA	1
POMD	3	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid		Liquid Gas	Maximal bubble pressure	10
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	7
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Buoyancy - hydrostatic balance	10
POMD	1 2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid		Liquid Gas	Maximal bubble pressure	50
POMD	1 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	35
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	50
POMD	1 3	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid		Liquid Gas	Maximal bubble pressure	50
POMD	1 3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	35
POMD	1 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	50

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

The surface tension, density and refractive index of amino acid ionic liquids: [C3mim][Gly] and [C4mim][Gly]

Tong, J.[Jing], Hong, M.[Mei], Chen, Y.[Yan], Wang, H.[Hui], Guan, W.[Wei], Yang, J. -Z.[Jia-Zhen]

ABSTRACT