Thermal properties of transition-metal compounds. Part I. Heat capacity, entropy, and standard heat of formation of tris(acetylacetonato)chromium(III)

Abstract

An adiabatic vacuum calorimeter has been used to measure the heat capacity of tris(acetylacetonato)chromium(III) from 80–300°K. An approximate extrapolation procedure has been used to estimate heat capacities below 80°K. Entropy, enthalpy, and free energy values have been derived at 10° intervals and are listed. The standard heat of formation and entropy of gaseous tris(acetylacetonato)chromium(III) have been evaluated at 298·16°K and 1 atmosphere pressure: ΔH_f°=–344·7 ± 1·0 k.cal. mole^–1; S°_298·16–S₀°= 142·4 ± 1·0 cal. deg.^–1 mole^–1.