Article,
Enthalpies of sublimation and vapour pressures of 11 polycyclic hydrocarbons
The Journal of Chemical Thermodynamics, 12 (3): 243 - 248 (1980)
DOI: DOI: 10.1016/0021-9614(80)90042-7
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,
DeltaHo(191.16 K) = (51.7 � 2) kJ mol-1; naphthalene, DeltaHo(267.88
K) = (74.4 � 0.5) kJ mol-1; anthracene, DeltaHo(351.28 K) = (100.4
� 1) kJ mol-1; phenanthrene, DeltaHo(325.03 K) = (90.5 � 1) kJ
mol-1; naphthacene, DeltaHo(437.04 K) = (128.1 � 2) kJ mol-1; chrysene,
DeltaHo(405.82 K) = (118.9 � 2) kJ mol-1; triphenylene, DeltaHo(395.15
K) = (115.6 � 2) kJ mol-1; 1,2-benzoanthracene, DeltaHo(385.77
K) = (113.5 � 1) kJ mol-1; pentacene, DeltaHo(512.60 K) = (154
� 5) kJ mol-1; 1,2:3,4-dibenzoanthracene, DeltaHo(439.53 K) = 139.1
� 2) kJ mol-1; 1,2:5,6-dibenzoanthracene, DeltaHo(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.
