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.