Thermodynamic Properties of Dibenzo-24-crown-8 in the Range from T → 0 to 500 K

The temperature dependence of the heat capacity of dibenzo-24-crown-8 in the range 6-500 K was measured by adiabatic vacuum and dynamic calorimetry with an accuracy of 0.2-0.5%. The physical transformations of the title compound occurring on its heating and cooling within the above temperature range were revealed and characterized. From the experimental data obtained for dibenzo-24-crown-8, its thermodynamic functions C4p0(T), H0(T) - H0(0), S0(T) - S0(0), and G0(T) - H0(0) were calculated for the range from T → 0 to 500 K; the standard entropy of formation from the elements, ΔsS0, at T 298.15 K was also calculated. The fractal dimensions D in the heat capacity function of the multifractal version of the Debye heat capacity theory, characterizing the heterodynamic characteristics of the title compound, were calculated.