Thermodynamic Properties of Thioxanthone between 80 and 540 K

Abstract

Much attention has been paid to experimental investigation of the thermodynamic properties of aromatic and heteroaromatic compounds since the beginning of the 20th century. The available data on thioxanthone (THX), sulfur-containing heterocycle, is in a significant scatter. The phase transition enthalpies of THX were reconciled by combining conventional measurements and empiric approaches recently developed in our laboratory. The heat capacities in the crystal and liquid states were determined by adiabatic calorimetry and power-compensated differential scanning calorimetry. The fusion enthalpy at the melting temperature was measured and adjusted to 298.15 K according to Kirchhoff’s law of thermochemistry. The value at 298.15 K was found using solution calorimetry. From these data, the temperature dependence of the sublimation enthalpy was evaluated. Ideal gas-phase heat capacities were calculated applying rigid rotor–harmonic oscillator approximation and then used to independently derive the temperature dependence of the sublimation enthalpy.

Phase Transition Thermodynamics of 1,3,5-Tris-(α-naphthyl)benzene: Theory and Experiment

“…The DSC was calibrated according to the manufacturer's recommendations using zinc and indium samples. The verification of the quality of the DSC used in the heat capacity measurements with standard samples was performed previously [32]. All experiments were performed in 40 mL aluminum crucibles in a dynamic nitrogen atmosphere (Nurgas, Kazan, Russia; volume fraction of nitrogen > 0.99999) with a gas flow rate of 30 mL min −1 .…”

Thermodynamic Properties of 3- and 4-Ethoxyacetanilides between 80 and 480 K

“…Reference Indium and Zinc samples were used for DSC calibration, as recommended by the manufacturer. After the calibration, ∆ l cr H(T m ) and C p,m of bismuth, benzoic acid, and anthracene were measured to check DSC performance, as previously [61]. The information on the samples' origin and purity is provided in Table S1.…”