Thermodynamic study of the sublimation of crystalline tris(1,1,1-trifluoro-2,4-pentanedionate)ruthenium(III) and tris(1,1,1,5,5,5-hexafluoro-2,4-pentanedionate)ruthenium(III)

• Type: Article in International Scientific Journal
• Date: 2001

Authors

da Silva, MAVR (Author) FCUP; Monte, MJS (Author) FCUP; Giera, E (Author) Other

Journal

Title: Journal of Chemical Thermodynamics

Vol. 33

Pages: 369-376

ISSN: 0021-9614

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 7 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-000-VZ7

DOI: 10.1006/jcht.2000.0734

Abstract (EN): The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of two crystalline ruthenium complexes: tris(1,1,1-trifluoro-2,4-pentanedionate)ruthenium(III) {Ru(tfacac)(3)}, between T = 350.20 K and T = 369.17 K and tris(1,1,1,5,5,5-hexafluoro-2,4-pentanedionate)ruthenium(III) {Ru(hfacac)(3)} between T = 299.15 K and T = 313.14 K. From the temperature dependence of the vapour pressure of the crystalline compounds, the standard molar enthalpies of sublimation were derived by the Clausius-Clapeyron equation and the molar entropies of sublimation at equilibrium pressures were calculated. By using an estimated value for the heat capacity differences between the gas and the crystal phases the standard, p(o) = 10(5) Pa, molar enthalpies, entropies, and Gibbs energies of sublimation at T = 298.15 K, were derived: [GRAPHICS] (C) 2001 Academic Press.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8