Calorimetric and computational study of 7-hydroxycoumarin

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Clara C S Sousa (Author) FCUP; Agostinha A R Matos (Author) FCUP; Victor M F Morais (Author) ICBAS

Journal

Title: Journal of Chemical Thermodynamics

Vol. 43 No. 2

Pages: 1435-1440

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 2 Citations

Scopus - 2 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-002-ME4

DOI: 10.1016/j.jct.2011.04.015

Abstract (EN): The standard (p(o) = 0.1 MPa) molar energy of combustion in oxygen, at T = 298.15 K, of 7-hydroxycoumarin was measured by static bomb calorimetry. The value of the standard molar enthalpy of sublimation was obtained by Calvet microcalorimetry and corrected to T = 298.15 K. Combining these results, the standard molar enthalpy of formation of the compound, in the gas phase, at T = 29815 K, has been calculated, -(337.5 +/- 2.3) kJ.mol(-1). The values for the temperature of fusion, T(fusion), and for the fusion enthalpy, at T = T(fusion), are also reported. Additionally, high-level density functional theory calculations using the B3LYP hybrid exchange-correlation energy functional with extended basis sets, the MC3BB and MC3MPW methods and more accurate correlated computational techniques of the MCCM suite have been performed for the compound. The agreement between experiment and theory gives confidence to estimate the enthalpy of formation of the remaining hydroxycoumarins substituted in the benzene ring.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6