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Vapour pressures and standard molar enthalpies of sublimation of seven crystalline copper(II) β-diketonates. The mean molar (Cu-O) bond-dissociation enthalpies

✍ Scribed by Manuel A.V. Ribeiro da Silva; Manuel J.S. Monte; Jan Huinink

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
555 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

Vapour pressures as functions of temperature of seven crystalline copper(II) b-diketonates, Cu2, were measured using either the Knudsen mass-loss effusion technique (Oporto apparatus), the simultaneous torsion and mass-loss effusion technique (Utrecht apparatus), or both. From the temperature dependence of the vapour pressure, the standard molar enthalpies of sublimation, at the mean temperature of the experimental temperature range, D g cr H°m( T ), were derived, and the standard molar enthalpies of sublimation, at the temperature 298.15 K, were calculated:

-1 D g cr H°m(298.15 K) kJ•mol -1 Cu()2 389.4 122.5 2 0.6 127.0 2 0.6 Cu()2 354.1 125.0 2 0.7 127.8 2 0.7 Cu()2 355.1 121.4 2 0.7 124.2 2 0.7 Cu()2 353.3 128.1 2 0.7 130.8 2 0.7 Cu()2 372.5 125.4 2 0.8 129.1 2 0.8 Cu()2 439.2 152.2 2 1.3 159.2 2 1.3 Cu()2 350.2 113.8 2 1.5 116.5 2 1.5

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