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Experimental and Computational Studies on the Molecular Energetics of Chlorobenzophenones

Experimental and Computational Studies on the Molecular Energetics of Chlorobenzophenones

Manuel A V Ribeiro da Silva, Luísa M P F Amaral, José R B Gomes

J Phys Chem B. 2007 Nov 15;111(45):13033-40.

PMID: 17960931

Abstract:

The standard (p degrees = 0.1 MPa) molar enthalpies of formation, Delta(f)H(m)degrees, of crystalline 2-, 3- and 4-chlorobenzophenone and 4,4'-dichlorobenzophenone were derived from the standard molar energies of combustion, Delta(c)U(m)degrees, in oxygen, to yield CO(2)(g), N(2)(g), and HCl x 600H(2)O(l), at T = 298.15 K, measured by rotating bomb combustion calorimetry. The Calvet high-temperature vacuum sublimation technique was used to measure the enthalpy of sublimation, Delta(cr)(g)H(m)degrees, of the compound 2-chlorobenzophenone. For the other three compounds, the standard molar enthalpies of sublimation, at T = 298.15 K were derived by the Clausius-Clapeyron equation, from the temperature dependence of the vapor pressures of these compounds, measured by the Knudsen-effusion technique. From the values of Delta(f)H(m)degrees and Delta(cr)(g)H(m)degrees, the standard molar enthalpies of formation of all the compounds, in the gaseous phase, Delta(f)H(m)degrees (g), at T = 298.15 K, were derived. These values were also calculated by using the B3LYP/6-311+G(2d,2p)//B3LYP/6-31G(d) computational approach.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP5162038	2-Chlorobenzophenone		5162-03-8	Price

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