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Author(s): Margarida Miranda
Maria Agostinha Matos
V.M. F. Morais
J. F. Liebman
Title: Experimental and computational study on the energetics of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene (dibenzosuberane)
Issue Date: 2010
Abstract: A study on the molecular structure and energetics of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene (dibenzosuberane) was performed combining experimental calorimetric techniques and high level computational calculations. In the experimental work, the solid phase standard (pring operator = 0.1 MPa) molar enthalpy of formation of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene was derived from its standard massic energy of combustion, at T = 298.15 K, measured by static bomb combustion calorimetry, in oxygen. The respective standard molar enthalpy of sublimation, at T = 298.15 K, was measured by Calvet microcalorimetry enabling the calculation of the standard molar enthalpy of formation (161.4 ± 3.7) kJ · mol−1, in the gaseous phase, at T = 298.15 K. In addition, computational calculations were performed using the density functional theory with the B3LYP hybrid functional and extended basis sets in order to obtain the molecular structure of 10,11-dihydro-5H-dibenzo[a,d]cycloheptene and that of related molecules. Estimates of the standard molar enthalpy of formation, in the gaseous phase, at T = 298.15 K, for 10,11-dihydro-5H-dibenzo[a,d]cycloheptene were performed using three different methods: G3(MP2)//B3LYP, MC3BB, and MC3MPW and appropriate homodesmic reactions. Computational estimates are in very good agreement with the experimental value.
Subject: Engenharia química
Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional

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