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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018-05-01

Autores

Manuel J S Monte (Autor) FCUP; Ana R R P Almeida (Autor) FCUP; Rafael Notario (Autor) Outra

Revista

Título: Journal of Thermal Analysis and Calorimetry

Vol. 132

Páginas: 1201-1211

ISSN: 1388-6150

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 9 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11