Low-Temperature Thermodynamic Properties of Palladium Bis-hexafluoroacetylacetonate

The heat capacity of palladium bis-hexafluoroacetylacetonate (Pd(C5HF6O2)2; CAS no. 64916-48-9) is measured adiabatically in the range of 6.088–307.596 K. The obtained data are used to calculate thermodynamic functions (entropy, increment of enthalpy, reduced Gibbs energy) in the range of 0–310 K. The functional behavior of the heat capacity exhibits an anomaly in the range of 145–285 K. The anomaly has a maximum at a temperature of T ≈ 225 K, indicating a second-order phase transition in this range of temperatures. Anomalous contributions to entropy and enthalpy are calculated.