ABSTRACT

Enthalpies of vaporization of several N,N-dialkyl monamides have been measured by correlation gas chromatography. The enthalpy values of the compounds are derived by an extrapolativemethod using the knownenthalpy of vaporization values of basic amides at 298.15 K, usedas standards. First order molecular connectivity valence indices of these amides (1 ) as described by Kier and Hall have been evaluated and are found to have an excellent correlation with measured enthalpies of vaporization in addition to several other indices, such as, solvent accessible surface area (SAS), molecular surface area (MSA) and solvent excluded volume (SEV). The quantitative structure property relationship (QSPR) approach is used to predict the enthalpies of vaporization from molecular connectivity valence index.

Compounds

#	Formula	Name
1	C3H7NO	dimethylformamide
2	C4H9NO	N,N-dimethylethanamide
3	C6H13NO	N,N-diethylacetamide
4	C16H33NO	N,N-dibutyloctanamide
5	C18H37NO	N,N-dihexylhexanamide
6	C20H41NO	N,N-dihexyloctanamide
7	C20H41NO	N,N-di-2-ethylhexylisobutyramide
8	C22H45NO	hexanamide, N,N-dioctyl-

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	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	7	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1
POMD	8	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Correlation gas chromatography	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of vaporization of N,N-dialkyl monamides at 298.15K

Panneerselvam, K., Antony, M. P., Srinivasan, T. G., Rao, P. R. V.

ABSTRACT