ABSTRACT

Apparent molar volumes, V2,f of amino acids (glycine and DL-a-alanine) in water and in aqueous solutions of ammonium based protic ionic liquids (PILs), namely, propylammonium formate (PAF) and 3-hydroxypropylammonium formate (3-HPAF) determined from precise density measurements, increase with concentration of amino acids and increase in temperature (288.15 318.15) K. Partial molar volume of transfer, DtV2 are both positive and negative in case of PAF, whereas only negative DtV2 values have been observed in case of 3-HPAF over the studied concentration range. Thermal expansion coefficients, (@V2 /@T)P of amino acids in presence of PILs are higher as compared to that observed inwater and further, (@2V2 /@T2)P values are found to be negative, which suggest that studied amino acids behave as structure breakers in these solutions. Hydration number, nH for studied amino acids in aqueous PILs solutions follows the order: 3-HPAF greater than PAF, which suggest a strong dehydration effect of PAF.

Compounds

#	Formula	Name
1	C2H5NO2	2-aminoacetic acid
2	C3H7NO2	DL-2-aminopropanoic acid
3	H2O	water
4	C4H11NO2	propylammonium formate
5	C4H11NO3	3-hydroxypropylammonium formate

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 3 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 4; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	200
POMD	2 3 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 4; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	180
POMD	1 3 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 5; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	160
POMD	2 3 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 5; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	144

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Volumetric properties of amino acids in aqueous solutions of ammonium based protic ionic liquids

Singh, V.[Vickramjeet], Chhotaray, P. K.[Pratap K.], Banipal, P. K.[Parampaul K.], Banipal, T. S.[Tarlok S.], Gardas, R. L.[Ramesh L.]

ABSTRACT