Redetermination of low-temperature heat capacity of Cu(C5H7O2)2

Abstract

The heat capacity of copper bis-acetylacetonate (Cu(C5H7O2)2) was measured over the temperature range (6.54–313.16) K by adiabatic-shield calorimetry. No anomalies associated with phase transition were found in the functional heat capacity behaviour. The Debye temperature at 0 K was calculated. The data obtained were used to calculate its thermodynamic functions (entropy, enthalpy, reduced Gibbs energy) in the range (0–313) K. They have the following values at 298.15 K: Cp° = (283.9 ± 0.5) J K−1 mol−1, Δ0298.15Sm° = (359.1 ± 0.8) J K−1 mol−1, Δ0298.15Hm° = (50.94 ± 0.09) kJ mol−1, Φm° = (188.3 ± 1.1) J K−1 mol−1. The value of the absolute entropy were used to calculate the entropy of formation of Cu(C5H7O2)2 (cr) at T = 298.15 K. The universal heat capacity behaviour of metal acetylacetonates was demonstrated in a wide temperature range.