publication . Article . 2000

Thermochemical and Theoretical Studies of 2-Hydroxyquinoxaline, 2,3-Dihydroxyquinoxaline, and 2-Hydroxy-3-methylquinoxaline

Ribeiro Da Suva, M. A. V.; Matos, M. A. R.; Rio, C. M. A.; Miranda, M. S.; Victor Morais;
  • Published: 01 Jan 2000
  • Country: Portugal
Abstract
The standard (p° ) 0.1 MPa) molar enthalpies of formation for crystalline 2-hydroxyquinoxaline, 2,3-dihydroxyquinoxaline, and 2-hydroxy-3-methylquinoxaline were derived from the standard molar enthalpies of combustion, in oxygen, at T ) 298.15 K, measured by static bomb combustion calorimetry. The standard molar enthalpies of sublimation, at T ) 298.15 K, of the three compounds were measured by Calvet microcalorimetry. The derived standard molar enthalpies of formation in the gaseous phase are 45.9 ( 4.3 kJ‚mol -1 for 2-hydroxyquinoxaline, -(179.2 ( 5.3) kJ‚mol -1 for 2,3-dihydroxyquinoxaline, and -(8.8 ( 4.9) kJ‚mol -1 for 2-hydroxy-3-methylquinoxaline. In addi...
Subjects
free text keywords: Enthalpies of formation, Hydroxyquinoxaline, Physical and Theoretical Chemistry, Isothermal microcalorimetry, Chemistry, Hydrogen bond, Combustion, Bond-dissociation energy, Standard enthalpy of formation, Physical chemistry, Calorimetry, Computational chemistry, Thermodynamics, Sublimation (phase transition), Density functional theory
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publication . Article . 2000

Thermochemical and Theoretical Studies of 2-Hydroxyquinoxaline, 2,3-Dihydroxyquinoxaline, and 2-Hydroxy-3-methylquinoxaline

Ribeiro Da Suva, M. A. V.; Matos, M. A. R.; Rio, C. M. A.; Miranda, M. S.; Victor Morais;