Thermodynamics of sublimation of aluminium triacetylacetonate

The equilibrium sublimation pressure Al(acac)3(s) = Al(acac)3(g) was measured in the range 376 ≤ T/K ≤ 467.5 by two procedures. One of them is mass spectrometric procedure “calibrated volume method” (CVM), which helped us to expand the possibilities of the effusion method toward the high pressure range. The second is the static method with quartz null Novikov–Suvorov manometers. Experimental data are in good agreement with each other. For this process, we obtained ln(P/Pa) = 35.67 − 13,207/T, calculated according to the second law of thermodynamics, enthalpy ΔsubH° (298.15) = 121.8 ± 1.5 kJ mol−1 and entropy ΔsubS° (298.15) = 235.5 ± 4.3 J mol−1 K−1; according to the third law, 122 ± 1.5 kJ mol−1 and 235.0 ± 5 J mol−1 K−1