ABSTRACT

The hydrogen-bond molecular interactions and molar ratio of stable adduct in binary mixtures of N,Ndimethylethanolamine with alcohols (ethyl alcohol, ethylene glycol, glycerol) and amides (formamide, N,N-dimethylformamide, N,N-dimethylacetamide) have been investigated over the entire concentration range at 30 .C by dielectric measurements. The effect of molecular size, number of hydroxyl groups of alcohols molecules and the extent of substitution in amide molecules on the hydrogenbond molecular interactions in amine.alcohols and amine.amides binary mixtures were determined using the concentration dependent values of the excess dielectric constant. Results confirm that N,Ndimethylethanolamine form expressive hydrogen-bond interactions with alcohols and behave weakly with N,N-dimethylformamide and N,N-dimethylacetamide, but these interactions are very strong with formamide.

Compounds

#	Formula	Name
1	C4H11NO	2-(N,N-dimethylamino)ethanol
2	C2H6O	ethanol
3	C2H6O2	1,2-ethanediol
4	C3H8O3	glycerol
5	CH3NO	formamide
6	C3H7NO	dimethylformamide
7	C4H9NO	N,N-dimethylethanamide

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	Phase	Method	#Points
POMD	1	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	2	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	3	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	4	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	5	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	6	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1
POMD	7	Relative permittivity at zero frequency ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Parallel plate capacitor	1

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Dielectric constant and molecular association in binary mixtures of N,N-dimethylethanolamine with alcohols and amides

Sengwa, R. J., Sankhla, S.[Sonu], Khatri, V.[Vinita]

ABSTRACT