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https://hdl.handle.net/10216/101573
Author(s): | Vera L S Freitas Jose R B Gomes Luis Gales Ana M Damas Maria D M C R Ribeiro da Silva |
Title: | Experimental and Computational Studies on the Structural and Thermodynamic Properties of Two Sulfur Heterocyclic Keto Compounds |
Issue Date: | 2010 |
Abstract: | The present work reports the standard (p degrees = 0.1 MPa) molar enthalpies of formation in the gaseous phase of thioxanthone, (91.9 +/- 2.4) kJ.mol(-1), and tetrahydrothio-gamma-pyrone, (-164.6 +/- 2.0) kJ.mol(-1), at T = 298.15 K, derived from their standard molar energies of combustion and standard molar enthalpies of sublimation, measured by rotating-bomb combustion calorimetry and by the vacuum drop microcalorimetric technique, respectively. For comparison purposes, we performed additional standard ab initio molecular orbital calculations, using the G3(MP2)//B3LYP composite procedure, which were used for the calculation of the enthalpies of several homodesmotic reactions, allowing us to extract the standard molar enthalpies of formation, in the gaseous phase, of the two heterocycles considered in this work. The calculated results are in excellent agreement with the experimental data. The three-dimensional structure of the crystal tetrahydrothio-gamma-pyrone was also determined by X-ray crystallography. |
Subject: | Engenharia química Chemical engineering |
Scientific areas: | Ciências da engenharia e tecnologias::Engenharia química Engineering and technology::Chemical engineering |
URI: | https://hdl.handle.net/10216/101573 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FCUP - Artigo em Revista Científica Internacional ICBAS - Artigo em Revista Científica Internacional |
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48180.pdf Restricted Access | 1.73 MB | Adobe PDF | Request a copy from the Author(s) |
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