The thermodynamic properties of thianthrene and phenoxathiin

Article abstract of DOI:10.1006/jcht.1993.1093

Measurements leading to the calculation of the standard thermodynamic properties are reported for thianthrene (Chemical Abstracts registry number <92-85-3>) and phenoxathiin (registry number <262-20-4>).Experimental methods included combustion calorimetry, adiabatic heat-capacity calorimetry, vibrating-tube densitometry, comparative ebulliometry, inclined-piston-gauge manometry, and differential-scanning calorimetry (d.s.c.).Critical properties were estimated for both materials based on the measurement results.Standard entropies, enthalpies, and Gibbs free energies of formation were derived for the gas for both compounds for selected temperatures between 298.15 K and 700 K.The property-measurement results reported here for thianthrene and phenoxathiin provide the first experimental gas-phase standard Gibbs free energies of formation for tricyclic diheteroatom-containing molecules.