THE THERMODYNAMIC PROPERTIES OF 4,5,9,10-TETRAHYDROPYRENE AND OF 1,2,3,6,7,8-HEXAHYDROPYRENE

Measurements leading to the calculation of the ideal-gas thermodynamic properties are reported for 4,5,9,10-tetrahydropyrene (Chemical Abstracts registry number [781-17-9]) and 1,2,3,6,7,8-hexahydropyrene (registry number [1732-13-4]). 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 measurements results. Standard entropies, enthalpies, and Gibbs free energies of formation were derived for the gases for selected temperatures between 380 K and 700 K. The property-measurement results reported here for 4,5,9,10-tetrahydropyrene and 1,2,3,6,7,8-hexahydropyrene are the first for these important intermediates in the (pyrene + hydrogen) reaction network. © 1993 Academic Press Ltd.