Experimental and computational study on the molecular energetics of benzyloxyphenol isomers

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

da Silva, MAVR (Autor) FCUP; Ana I M C L Lobo Ferreira (Autor) FCUP; Cimas, A (Autor) Outra

Revista

Título: Journal of Chemical Thermodynamics

Vol. 43

Páginas: 1857-1864

ISSN: 0021-9614

Editora: Elsevier

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-002-JFN

DOI: 10.1016/j.jct.2011.06.014

Abstract (EN): This paper reports a combined experimental and computational thermochemical study of 4-benzyloxyphenol. Static bomb combustion calorimetry and Knudsen mass-loss effusion technique were used to determine the standard (p(o) = 0.1 MPa) molar enthalpy of combustion, Delta H-c(m)o = -(6580.1 +/- 1.8) kJ. mol(-1), and of sublimation, Delta H-g(cr)m(o)= (131.0 +/- 0.9) kJ . mol(-1), respectively, from which the standard (p(o) = 0.1 MPa) molar enthalpy of formation, in the gaseous phase, at T = 298.15 K, Delta H-t(m)o = -(119.5 +/- 2.7) kJ . mol(-1) were derived. For comparison purposes, the gas-phase enthalpy of formation of this compound was estimated by G3(MP2)//B3LYP calculations, using a set of gas-phase working reactions; the results are in excellent agreement with experimental data. G3(MP2)//B3LYP computations were also extended to the calculation of the gas-phase enthalpies of formation of the 2- and 3-benzyloxyphenol isomers. Furthermore, this composite approach was also used to obtain information about the gas-phase acidities, gas-phase basicities, proton and electron affinities, adiabatic ionization enthalpies and, finally, O-H bond dissociation enthalpies.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8