Thermodynamic properties of 4-tert-butyl-diphenyl oxide

•The sample of the 4-tert-butyl-diphenyl oxide was synthesized and purified.•Heat capacities, energy of combustion, saturation vapor pressures were measured.•The temperature, the enthalpy and the entropy of fusion were determined.•The enthalpy of sublimation at T = 298.15 K was derived.•The main thermodynamic functions and functions of formation were computed.

The main thermodynamic functions (changes of the entropy, enthalpy, and Gibbs free energy) and functions of formation at T = 298.15 K of 4-tert-butyl-diphenyl oxide in condensed and ideal gas states were computed on the basis of experimental results obtained. The heat capacities of 4-tert-butyl-diphenyl oxide was measured by vacuum adiabatic calorimetry over the temperature range (8 to 371) K. The temperature, the enthalpy and the entropy of fusion were determined. The energy of combustion of the sample was determined by static-bomb combustion calorimetry. The saturation vapor pressures of the substance were measured by dynamic transpiration method over the temperature and pressure intervals (298 to 325) K and (0.05 to 1.2) Pa. The enthalpy of sublimation at T = 298.15 K was derived. The contribution of O-(2Cb) group (where Cb is the carbon atom in a benzene ring) into the absolute entropies of diphenyl oxide derivatives was assessed.