Abstract

The thermodynamic properties of styrenetricarbonylchromium, α-methylstyrenetricarbonylchromium, and p-methylstyrenetricarbonylchromium were studied with adiabatic vacuum and dynamic calorimeters. The heat capacity in the range 5-450 K (error about 0.3% in most cases) and the temperatures and enthalpies of the phase transitions were determined. The experimental data were used to calculate the thermodynamic functions C0p(T), H0(T) - H0(0), S0(T), and G0(T) - H0(0) for the range from 0 to 330-400 K, and also the isochoric heat capacity Cv and its lattice (Cv,latt) and atomic (Cv,at) contributions for the range from 0 K to T0m; the parameters γ = C0p/Cv were evaluated. The thermodynamic properties were considered in relation to the composition and structure of the compounds.

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