Volatility and chemical stability of chromium, molybdenum, and tungsten hexacarbonyls

• Type: Article in International Scientific Journal
• Date: 2018-05-01

Authors

Manuel J S Monte (Author) FCUP; Ana R R P Almeida (Author) FCUP; Rafael Notario (Author) Other

Journal

Title: Journal of Thermal Analysis and Calorimetry

Vol. 132

Pages: 1201-1211

ISSN: 1388-6150

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-00N-TB8

DOI: 10.1007/s10973-018-7033-1

Abstract (EN): The sublimation vapor pressures of three metallic (group 6) hexacarbonyls, Cr(CO)(6), Mo(CO)(6), and W(CO)(6), were measured using the Knudsen mass-loss effusion method. The standard (p (o) = 0.1 MPa) molar enthalpies, entropies, Gibbs energies, and heat capacity difference between the gas and solid state, at T = 298.15 K, were derived from the experimental results combined with selected literature ones covering a wide range of temperature. The temperatures and molar enthalpies of fusion of those compounds were measured using differential scanning calorimetry. The thermodynamic stability of the hexacarbonyls was evaluated taking into account the standard Gibbs energies of formation in the crystalline and gaseous phases. Gas-phase absolute entropies, heat capacities, and enthalpies of formation of the three compounds studied as well as the bond distances M-C and C-O were calculated.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11