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An examination of the vaporization enthalpies and vapor pressures of pyrazine, pyrimidine, pyridazine, and 1,3,5-triazine

Content Provider	Springer Nature Link
Author	Lipkind, Dmitri Chickos, James S.
Copyright Year	2008
Abstract	The vaporization enthalpies and liquid vapor pressures from T = 298.15 K to T = 400 K of 1,3,5-triazine, pyrazine, pyrimidine, and pyridazine using pyridines and pyrazines as standards have been measured by correlation-gas chromatography. The vaporization enthalpies of 1,3,5-triazine (38.8 ± 1.9 kJ mol$^{−1}$) and pyrazine (40.5 ± 1.7 kJ mol$^{−1}$) obtained by these correlations are in good agreement with current literature values. The value obtained for pyrimidine (41.0 ± 1.9 kJ mol$^{−1}$) can be compared with a literature value of 50.0 kJ mol$^{−1}$. Combined with the condensed phase enthalpy of formation in the literature, this results in a gas-phase enthalpy of formation, Δ$_{f}$ H $_{m}$ (g, 298.15 K), of 187.6 ± 2.2 kJ mol$^{−1}$ for pyrimidine, compared to a value of 195.1 ± 2.1 calculated for pyrazine. Vapor pressures also obtained by correlation are used to predict boiling temperatures (BT). Good agreement with experimental BT (±4.2 K) including results for pyrimidine is observed for most compounds with the exception of the pyridazines. The results suggest that compounds containing one or two nitrogen atoms in the ring are suitable standards for correlating various heterocyclic compounds provided the nitrogen atoms are isolated from each other by carbon. Pyridazines do not appear to be evaluated correctly using pyridines and pyrazines as standards.
Starting Page	49
Ending Page	58
Page Count	10
File Format	PDF
ISSN	10400400
Journal	Structural Chemistry
Volume Number	20
Issue Number	1
e-ISSN	15729001
Language	English
Publisher	Springer US
Publisher Date	2008-11-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pyridine Pyrazine Pyrimidine Vaporization enthalpy Enthalpy of formation Vapor pressure Theoretical and Computational Chemistry Physical Chemistry Computer Applications in Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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