ABSTRACT

Static dielectric constants of the binary mixtures of amides (formamide (FA), Nmethylformamide (NMF), N,N-dimethylformamide (DMF), and N,N-dimethylacetamide (DMA)) with alcohols (ethyl alcohol (EA) and ethylene glycol (EG)) over the entire composition range have been investigated at 30 oC. The concentration dependent excess dielectric constant of the binary mixtures reveal that the strength of H {bond molecular interactions of amide family molecules vary significantly with EA and EG molecules and these interactions are governed by their H!Vbonded self-association strength. The EA molecules form the strong H!Vbonded 1:1 complexes with FA and NMF, whereas EG molecules have the strong interactions only with NMF molecules and form stable adduct of molar ratio 2:1 of NMF to EG molecules. The DMF and DMA have comparative weak H!Vbonded interactions with both the EA and EG molecules, which is influenced by molecular size of these amides.

Compounds

#	Formula	Name
1	CH3NO	formamide
2	C3H7NO	dimethylformamide
3	C4H9NO	N,N-dimethylethanamide
4	C2H6O	ethanol
5	C2H6O2	1,2-ethanediol
6	C2H5NO	N-methylformamide

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	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	2	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	3	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	4	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	5	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	6	Relative permittivity at various frequencies ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	capacitance measurements at 1 MHz	1
POMD	4 1	Relative permittivity at various frequencies ; Liquid	Mole fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16
POMD	4 6	Relative permittivity at various frequencies ; Liquid	Mole fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	11
POMD	4 2	Relative permittivity at various frequencies ; Liquid	Mole fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16
POMD	4 3	Relative permittivity at various frequencies ; Liquid	Mole fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16
POMD	1 5	Relative permittivity at various frequencies ; Liquid	Mole fraction - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16
POMD	5 6	Relative permittivity at various frequencies ; Liquid	Mole fraction - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	11
POMD	2 5	Relative permittivity at various frequencies ; Liquid	Mole fraction - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16
POMD	5 3	Relative permittivity at various frequencies ; Liquid	Mole fraction - 5; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	capacitance measurements at 1 MHz	16

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Dielectric constants and hydrogen bonded structures in amide-alcohol mixed solvents

Sengwa, R. J., Khatri, V.[Vinita]

ABSTRACT