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

• 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 Alloys and Compounds

Vol. 224

Pages: 181-183

ISSN: 0925-8388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 3