Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The heat capacity for tris-hexafluoroacetylacetonate of aluminium (Al(C5HF6O2)3 or tris(1,1,1,5,5,5-hexafluoro-2,4-pentanedionate) aluminium (III)) within a temperature range (9.83-299.76) K has been measured by the adiabatic method. The functional behaviour of sample's heat capacity was analysed. No phase transition-related anomalies in the heat capacity behaviour were found. Crystal lattice anisotropy of a studied complex was evaluated. The Debye temperature at 0 K was calculated. The obtained data were used to calculate smoothed values of heat capacity, entropy, enthalpy, and reduced Gibbs energy in a temperature range of 0 K to 300 K. They have the following values at 298.15 K: C.deg.p,m = (608.3 +- 1.0) J K-1 mol-1, delta0298.15S.deg.m = (786.5 +- 2.1) J K-1 mol-1, delta0298.15H.deg.m = (106.91 +- 0.20) kJ mol-1, phi.deg.m = (428.0 +- 1.4) J K-1 mol-1. The value of the absolute entropy were used to calculate the entropy of formation of Al(C5HF6O2)3 (cr) at T = 298.15 K.