VAPOR-PRESSURES AND STANDARD MOLAR ENTHALPIES OF SUBLIMATION OF BERYLLIUM(II) AND ALUMINUM(III) BENZOYLACETONATES

• Tipo: Artigo em Revista Científica Internacional
• Data: 1995

Autores

DASILVA, MAVR (Autor) FCUP; MONTE, MJS (Autor) FCUP; HUININK, J (Autor) Outra

Revista

Título: Journal of Alloys and Compounds

Vol. 224

Páginas: 181-183

ISSN: 0925-8388

Editora: Elsevier

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-001-GPD

Abstract (EN): The simultaneous torsion and mass-loss effusion technique was used to measure the vapour pressure of crystalline bis(benzoylacetonato)beryllium (II) - Be(BZAC)(2) - and tris(benzoylacetonato) aluminium(III) - AI(BZAC)(3) -, as a function of temperature, from 415.7 K to 437.6 K and from 461.9 K to 478.2 K respectively. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation, at the mean temperature of the experimental temperature ranges, were derived for both complexes. The mean values obtained from both techniques are: Be(BZAC)(2), Delta(cr)(g)H(m)(o)(426.6 K)=151.6+/-1.8 kJ mol(-1); AI(BZAC)(3), Delta(cr)(g)H(m)(o)(470.1 K)=186.6+/-2.1 kJ mol(-1). Using the estimated value of Delta(cr)(g)C(p)(o) -50 J K-1 mol(-1), for both beryllium(Il) and aluminium(III) complexes, the standard molar enthalpies of sublimation at 298.15 K, were calculated as 158.0+/-1.8 kJ mol(-1) and 195.2+/-2.1 kJ mol(-1) respectively.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 3