Vapor pressures and enthalpies of sublimation of ten polycyclic aromatic hydrocarbons determined via the Knudsen effusion method

The vapor pressures of ten polycyclic aromatic hydrocarbons, ranging in molecular weight from (152 to 252) g.mol(-1). were measured using the Knudsen effusion technique in the temperature range of (297 to 432) K. These compounds included those for which there were few or conflicting data in the literature: acenaphthylene, acenaphthene, fluoranthene, benzo[a]phenanthrene, 9,10-benzophenanthrene, benzo[a]pyrene, and perylene. Anthracene, fluorene, and pyrene were also examined to establish the reliability of the presently implemented method. Enthalpies of sublimation of these compounds were determined via application of the Clausius-Clapeyron equation.