title: Vaporization, Sublimation Enthalpy, and Crystal Structures of Imidazo[1,2‑a]pyrazine and Phthalazine
metadata.name: dc.contributor.author
metadata.value: Mori Massiel, Rath Nigam
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Gobble Chase, Chickos James
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Samarov Artemiy A., Verevkin Sergey P.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2016-04-08T07:51:26Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2016-04-08T07:51:26Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2016
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 0021-9568
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/1973
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The vaporization enthalpy of imidazo[1,2-a]pyrazine is evaluated by correlation gas chromatography using two sets of standards and by transpiration. Vaporization enthalpies were evaluated using heterocyclic standards with dipole moments that vary from 0 to 3.0 D and using standards with dipole moments > 3.0 D. A value of (70.7 ± 1.0) kJ·mol−1 measured by transpiration compares to (67.9 ± 1.4) kJ·mol−1 measured by correlation gas chromatography using standards characterized by dipole moments > 3.0 D. The results suggest that imidazo[1,2-a]pyrazine is a member of this series of compounds whose vaporization enthalpies exceed those less polar heterocycles by a fairly constant amount, (6.9 ± 0.3) kJ·mol−1,in this case by (5.9 ± 3.0) kJ·mol−1 using the less polar heterocycles. The crystal structures of phthalazine, another member of the polar series, and of imidazo[1,2-a]pyrazine were determined to examine whether π−π stacking, present in the solid state of two other members of the polar series, was a characteristic of this series. If present in the liquid, π−π stacking could offer a possible explanation for the vaporization enthalpy differences observed. The sublimation enthalpy of imidazo[1,2-a]pyrazine was also evaluated.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: American Chemical Society
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Journal of Chemical & Engineering Data;61
metadata.lang: -
metadata.name: dc.title
metadata.value: Vaporization, Sublimation Enthalpy, and Crystal Structures of Imidazo[1,2‑a]pyrazine and Phthalazine
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: Mori et al. - 2016 - Vaporization, Sublimation Enthalpy, and Crystal Structures of Imidazo1,2- a pyrazine and Phthalazine.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/1973/1/Mori%20et%20al.%20-%202016%20-%20Vaporization%2c%20Sublimation%20Enthalpy%2c%20and%20Crystal%20Structures%20of%20Imidazo1%2c2-%20a%20pyrazine%20and%20Phthalazine.pdf
resources.format: Adobe PDF
resources.size: 3,11 MB