Journal Title
Title of Journal: Struct Chem
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Abbravation: Structural Chemistry
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Authors: Dmitri Lipkind James S Chickos
Publish Date: 2008/11/26
Volume: 20, Issue: 1, Pages: 49-58
Abstract
The vaporization enthalpies and liquid vapor pressures from T = 29815 K to T = 400 K of 135triazine pyrazine pyrimidine and pyridazine using pyridines and pyrazines as standards have been measured by correlationgas chromatography The vaporization enthalpies of 135triazine 388 ± 19 kJ mol−1 and pyrazine 405 ± 17 kJ mol−1 obtained by these correlations are in good agreement with current literature values The value obtained for pyrimidine 410 ± 19 kJ mol−1 can be compared with a literature value of 500 kJ mol−1 Combined with the condensed phase enthalpy of formation in the literature this results in a gasphase enthalpy of formation Δf H m g 29815 K of 1876 ± 22 kJ mol−1 for pyrimidine compared to a value of 1951 ± 21 calculated for pyrazine Vapor pressures also obtained by correlation are used to predict boiling temperatures BT Good agreement with experimental BT ±42 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
Keywords:
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