Abstract
Durene photodehydrogenation in the solid state yields duryl radicals. In doped crystals, the radicals are produced with lambda > 3000 A radiations absorbed by the guests in the high (120 to 300 K) temperature range, and with lambda < 2700 A radiations absorbed by the durene host in the low (2 to 40 K) temperature range. In the latter case, the reaction requires two photons and no substantial activation energy. The fluorescence spectra of duryl radicals produced below 40 K present a multisite structure which is nonreversibly modified by annealing the crystals. The simplified fluorescence spectra exhibited by the annealed samples correspond to radicals located in substitutional sites of the regular durene lattice. From the spectroscopic data obtained at very low temperatures, it is concluded that the durene photodehydrogenation takes place in the structural imperfections of the lattice where the excitation energy can be trapped. These physical defects are different in pure and in doped durene crystals. 7 figures, 2 tables.
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