R. Chirico, I. A. Hossenlopp, A. Nguyen
Feb 1, 1989
Citations
0
Influential Citations
11
Citations
Journal
The Journal of Chemical Thermodynamics
Abstract
Abstract Measurements leading to the calculation of the ideal-gas thermodynamic properties for 4-methylphenanthrene are reported. Thermochemical and thermophysical properties were determined by adiabatic heat-capacity calorimetry, combustion calorimetry, comparative ebulliometry, and inclined-piston manometry. Results were used to calculate entropies, enthalpies, and Gibbs energies of formation for the ideal-gas state at selected temperatures to 500 K. Group-contribution methods involving comparisons for a series of methyl-substituted aromatic molecules were used to demonstrate the consistency of ideal-gas entropies and the enthalpy of formation determined for 4-methylphenanthrene with literature values for related compounds. The results are shown to be in accord with a barrier to methyl rotation from the literature determined using n.m.r. spectroscopy.