ABSTRACT

N,N-dimethylethanolammonium (DMEA) based ionic liquids with carboxylate anions are very important in organic synthesis, gas absorption, biological and pharmaceutical applications. The fundamental physiochemical properties will give a platform to better understanding of their nature for scientific community. Here in this work, five DMEA based protic ionic liquids (PILs) with carboxylates were synthesized and their physicochemical properties such as density (r) and speed of sound (u) were measured as a function of temperature from (293.15 - 343.15) K at 0.1 MPa pressure. Several derived thermophysical properties such as molecular volume (Vm), standard entropy (S ), isothermal expansion coefficient (a) and isentropic compressibility have been calculated using experimental data. The effects of carboxylate anion chain length and temperature on physicochemical properties have been discussed. The crystal potential energy (UPOT) of ionic liquid compared with MX type of inorganic salt and discussed for ion interaction in PILs.

Compounds

#	Formula	Name
1	C6H15NO3	2-hydroxy-N,N-dimethylethan-1-aminium acetate
2	C7H17NO3	2-hydroxy-N,N-dimethylethan-1-aminium propionate
3	C8H19NO3	2-hydroxy-N,N-dimethylethan-1-aminium butyrate
4	C9H21NO3	2-hydroxy-N,N-dimethylethan-1-aminium pentanoate
5	C10H23NO3	2-hydroxy-N,N-dimethylethan-1-aminium hexanoate
6	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	11
POMD	1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	4	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	6 3	Mass density, kg/m3 ; Liquid	Mass fraction - 6; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Vibrating tube method	4
POMD	6 3	Speed of sound, m/s ; Liquid	Mass fraction - 6; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	4

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Effect of anion chain length on physicochemical properties of N,N-dimethylethanolammonium based protic ionic liquids

Sharma, G.[Gyanendra], Gardas, R. L.[Ramesh L.], Coronas, A.[Alberto], Venkatarathnam, G.

ABSTRACT