Enthalpies of sublimation and vapour pressures of 11 polycyclic hydrocarbons

Abstract Simultaneous torsion- and weighing-effusion techniques were used to measure the vapour pressure as a function of temperature. The enthalpies of sublimation were derived from the temperature dependence of the vapour pressures. Overall mean values for both techniques are: benzene, ΔHo(191.16 K) = (51.7 ± 2) kJ mol−1; naphthalene, ΔHo(267.88 K) = (74.4 ± 0.5) kJ mol−1; anthracene, ΔHo(351.28 K) = (100.4 ± 1) kJ mol−1; phenanthrene, ΔHo(325.03 K) = (90.5 ± 1) kJ mol−1; naphthacene, ΔHo(437.04 K) = (128.1 ± 2) kJ mol−1; chrysene, ΔHo(405.82 K) = (118.9 ± 2) kJ mol−1; triphenylene, ΔHo(395.15 K) = (115.6 ± 2) kJ mol−1; 1,2-benzoanthracene, ΔHo(385.77 K) = (113.5 ± 1) kJ mol−1; pentacene, ΔHo(512.60 K) = (154 ± 5) kJ mol−1; 1,2:3,4-dibenzoanthracene, ΔHo(439.53 K) = 139.1 ± 2) kJ mol−1; 1,2:5,6-dibenzoanthracene, ΔHo(449.48 K) = (148.8 ± 2) kJ mol−1. Each temperature given is a mid-range value and is such that the vapour pressure of each substance is 0.4 Pa at that temperature.

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