The vapour pressure and sublimation enthalpy of HPLC-purified C-84 hav
e been determined by Knudsen cell mass spectrometry in the temperature
range 658-980 K; the temperature-pressure equation is In(p/Pa) = (-24
337 +/-539)/(T/K) + (25.15 +/- 0.64), and the mean sublimation enthalp
y at 853 K is 202 +/- 4 kJ mol(-1).