Thermochemical studies of 1-hydroxyisoquinoline, 5-hydroxyisoquinoline and 1,5-dihydroxyisoquinoline |
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| Authors: | Manuel A.V. Ribeiro da Silva,Maria Agostinha R. Matos,Luí sa M.P.F. Amaral |
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| Affiliation: | Centro de Investigação em Química, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal |
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| Abstract: | The standard (p° = 0.1 MPa) molar enthalpies of formation,  , for crystalline 1-hydroxyisoquinoline, 5-hydroxyisoquinoline and 1,5-diidroxyisoquinoline, were derived from the standard molar enthalpies of combustion, in oxygen, at the temperature 298.15 K, measured by static bomb-combustion calorimetry. The standard molar enthalpies of sublimation,  , at T = 298.15 K, were determined by Calvet microcalorimetry. The results were as follows: |  |  |
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| 1-Hydroxyisoquinoline | 4395.1 ± 1.5 | 113.6 ± 2.2 | | 5-Hydroxyisoquinoline | 4455.2 ± 1.9 | 109.6 ± 2.1 | | 1,5-Dihydroxyisoquinoline | 4194.1 ± 2.2 | 123.6 ± 2.2 |
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| Keywords: | Standard molar enthalpy of formation Standard molar enthalpy of sublimation Combustion calorimetry Hydroxyisoquinolines |
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