ABSTRACT

Physicochemical properties of diethylammonium (DEA) based protic ionic liquids and their aqueous solutions were obtained using experimental measurements of density () at different temperatures from T = (293.15 to 313.15) K and speed of sound (w) at 298.15 K. Four DEA based protic ionic liquids (PILs) with carboxylates as anions were synthesized. The standard entropy ( S 0 ) and lattice potential energy ( U POT ) for pure PILs were estimated from molecular volumes at 298.15 K obtained using experimental density data. Apparent molar volumes ( V ), isobaric expansivity ( ), isentropic compressibility ( s ) and isothermal compressibility ( T ) have been obtained for aqueous solutions of PILs using experimental density and speed of sound data. These data have been further used to understand the electrostriction and concentration dependence of internal pressure. The Passynski method has been used to estimate concentration dependent hydration numbers of PILs. The results obtained have been discussed in terms of concentration and temperature dependence hydrophobic hydration, hydrophobic ion association, water structural changes etc. It has been observed that hydrophobic hydration persist in the entire studied concentration and temperature range. Critical examination of data and results obtained reveals that the studied bio-ionic liquids can act as potential candidates for pharmaceutical industry and in protein chemistry.

Compounds

#	Formula	Name
1	C5H13NO2	diethylammonium formate
2	C6H15NO2	diethylammonium acetate
3	C7H17NO2	diethylammonium propanoate
4	C8H19NO2	diethylammonium butanoate
5	H2O	water

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	5
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	5	Speed of sound, m/s ; Liquid		Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Linear variable-path acoustic interferometer	2
POMD	1 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	85
POMD	1 5	Speed of sound, m/s ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Linear variable-path acoustic interferometer	11
POMD	2 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	75
POMD	2 5	Speed of sound, m/s ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Linear variable-path acoustic interferometer	11
POMD	3 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	85
POMD	3 5	Speed of sound, m/s ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Linear variable-path acoustic interferometer	11
POMD	4 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	85
POMD	4 5	Speed of sound, m/s ; Liquid	Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Linear variable-path acoustic interferometer	11

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

Density and Speed-of-Sound Measurements for Dilute Binary Mixtures of Diethylammonium-Based Protic Ionic Liquids with Water

Musale, Shrikant P., Patil, Kunal R., Gavhane, Rajshree J., Dagade, Dilip H.

ABSTRACT