10.1021/je900034d.s001
Dmitri Lipkind
Dmitri
Lipkind
William Hanshaw
William
Hanshaw
James S. Chickos
James S.
Chickos
Hypothetical Thermodynamic Properties. Subcooled Vaporization Enthalpies and Vapor Pressures of Polyaromatic Heterocycles and Related Compounds
American Chemical Society
2009
298.15 K
Related CompoundsThe vaporization enthalpies
Subcooled Vaporization Enthalpies
sublimation enthalpy value
phenanthroline
Hypothetical Thermodynamic Properties
literature values
polyaromatic nitrogen heterocyles
dipyridine
correlation gas chromatography
PANH
2009-10-08 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Hypothetical_Thermodynamic_Properties_Subcooled_Vaporization_Enthalpies_and_Vapor_Pressures_of_Polyaromatic_Heterocycles_and_Related_Compounds/2822581
The vaporization enthalpies and vapor pressures of the liqiud phase from <i>T</i> = 298.15 K to <i>T</i> = 500 K of a series of polyaromatic nitrogen heterocyles (PANH) have been derived using correlation gas chromatography. The vaporization enthalpies at <i>T</i> = 298.15 K measured in kilojoules per mole include: tri-<i>n</i>-butylamine (62.7 ± 1.3), 2-phenylpyridine (68.4 ± 1.9), 3-phenylpyridine (68.4 ± 1.6), quinazoline (58.9 ± 2.0), (−)-nicotine (63.9 ± 2.1), 4-phenylpyrimidine (68.8 ± 2.5), 2,2-dipyridine (67.0 ± 2.3), 2,4-dipyridine (70.9 ± 1.6), 4,4-dipyridine·1.7H<sub>2</sub>O (70.7 ± 2.4), 4,4-dipyridine (anhydrous, 71.1 ± 2.6), 1,7-phenanthroline (79.4 ± 4.7), 4,7-phenanthroline (80.8 ± 4.8), 2-benzylpyridine (69.8 ± 2.8), and 9-methylcarbazole (79.4 ± 3.2). Fusion enthalpies (kJ·mol<sup>−1</sup>, <i>T</i><sub>fus</sub>/K) are also reported for 2,4-bipyridine (17.4 ± 0.4, 332.8), 4,4-dipyridine (16.1 ± 1.0, 377.5), 4,4-dipyridine·1.7H<sub>2</sub>O (35.5 ± 0.5, 341.3), 4-phenylpyrimidine (18.8 ± 0.3, 334.1), 1,7-phenanthroline (18.2 ± 0.3, 350.3), and 4,7-phenanthroline (21.8 ± 0.5, 445.5). Vaporization enthalpy comparisons are made with available literature values by means of a thermochemical cycle; agreement is within the combined experimental uncertainties for all compounds except 4,4-dipyridine, for which evidence is provided that suggests that the current sublimation enthalpy value in the literature was measured on a hydrated form. Vapor pressures and normal boiling temperatures for the liquid phase are compared with available experimental literature values at elevated temperatures. Good agreement is found for most compounds.