VAPOR-PRESSURES AND STANDARD MOLAR ENTHALPIES OF SUBLIMATION OF 7 CRYSTALLINE COPPER(II) BETA-DIKETONATES - THE MEAN MOLAR (CU-O) BOND-DISSOCIATION ENTHALPIES

• Type: Article in International Scientific Journal
• Date: 1995

Authors

DASILVA, MAVR (Author) FCUP; MONTE, MJS (Author) FCUP; HUININK, J (Author) Other

Journal

Title: Journal of Chemical Thermodynamics

Vol. 27

Pages: 175-190

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 40 Citations

Scopus - 49 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-001-HB1

DOI: 10.1006/jcht.1995.0014

Abstract (EN): Vapour pressures as functions of temperature of seven crystalline copper(II) beta-diketonates, CuL(2), were measured using either the Knudsen mass-loss effusion technique (Oporto apparatus), the simultaneous torsion and mass-loss effusion technique (Utrecht apparatus), or both. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation, at the mean temperature of the experimental temperature range, Delta(cr)(g) H-m degrees ((T)), were derived, and the standard molar enthalpies of sublimation, at the temperature 298.15 K, were calculated: [GRAPHICS] where HACAC, pentane-2,4-dione; HPIPRM, 2,2-dimethylheptane-3,5-dione; HDIBM, 2,6-dimethylheptane-3,5-dione; HIBPM, 2,2, 6-trimethylheptane-3,5-dione; HDPM, 2,2,6,6-tetramethylheptane-3,5-dione; HBZAC, 1-phenylbutane-1,3-dione; and HTFAC, 1,1,1-trifluoropentane-2,4-dione. The consistency of the vapour-pressure measurements was tested by measuring the vapour pressures of benzoic acid, at various temperatures, by different experimental techniques: Knudsen mass-loss effusion, simultaneous torsion and mass-loss effusion technique, and spinning rotor. From the standard molar enthalpies of formation of the gaseous complexes, the mean molar (Cu-O) bond-dissociation enthalpies were derived.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16