Thermodynamic study on hydroxybenzaldehyde derivatives: 3-and 4-Hydroxybenzaldehyde isomers and 3,5-di-tert-butyl-2-hydroxybenzaldehyde

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Maria D M C R Ribeiro da Silva (Author) FCUP; Mariana V Goncalves (Author) Other; Manuel J S Monte (Author) FCUP

Journal

Title: Journal of Chemical Thermodynamics

Vol. 42 No. 10

Pages: 472-477

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 18 Citations

Scopus - 18 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-003-7WC

DOI: 10.1016/j.jct.2009.10.009

Abstract (EN): Reported in the present work are the values of the gaseous standard (p degrees = 0.1 MPa) molar enthalpies of formation of 3-hydroxybenzaldehyde (3HBA), 4-hydroxybenzaldehyde (4HBA), and 3,5-di-tert-butyl-2-hydroxybenzaldehyde (3,5DTBHBA), at T = 298.15 K. For the three compounds, the values were derived from measurements of the standard molar energies of combustion of the crystalline compounds, using a static bomb calorimeter {Delta(c)H degrees m(3HBA) = -(3298.3 +/- 1.3) kJ . mol(-1) . Delta(c)H degrees(m)(4HBA) = -(3291.8 +/- 0.9) kJ . mol(-1) . Delta(c)H degrees(m)(3, 5DTBHBA) = -(8502.6 +/- 2.9) kJ . mol(-1)}, together with the standard molar enthalpies of sublimation, at T = 298.15 K, derived from the vapour pressures measured at different temperatures using the Knudsen effusion technique {Delta(g)(cr)H degrees m(3HBA) = (100.1 +/- 0.6) kJ . mol(-1) . Delta (g)(cr)H degrees(m)(4HBA) = (102.5 +/- 0.5) kJ . mol(-1), Delta(g)(cr)H degrees(m)(3, 5DTBHBA) = (96.0 +/- 0.5) kJ . mol(-1)}

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6