The heat capacity, entropy, enthalpy, and reduced gibbs energy of chromium(III) tris(acetylacetonate) in the temperature range 5-320 K

The heat capacity of chromium tris(acetylacetonate) was measured by the adi abatic method in the temperature range 5-320 K. Heat capacity anomalies wer e observed, of which the most pronounced at 60 K was treated as correspondi ng to a phase transition. Anomalous contributions to the entropy and enthal py were determined. The experimental heat capacities of CT(C5H7O2)(3) were used to calculate the thermodynamic functions of the compound (entropy, ent halpy, and reduced Gibbs energy) in the temperature range 0-320 K. Reversib le changes in color of Cc(C5H7O2)(3) were observed. A change in color from red (below 120 K) to dark violet (above 210 K) occurred in the temperature range 120-210 K.