Photochemical degradation of 1-nitropyrene, 2-nitrofluorene, 2,7-dinitrofluorene, 6-nitrochrysene, 3-nitrofluoranthene, 5-nitroacenaphthene, and 9-nitroanthracene were examined in CHCl 3 , CH 2 Cl 2 , DMF, DMF/H 2 O (80/20), CH 3 CN, or CH 3 CN/H 2 O (80/20). The degradation follows mostly the 1 st order kinetics; but a few follow 2 nd order kinetics or undergo self-catalysis. The photodegradation rates follow the order: CHCl 3 > CH 2 Cl 2 > DMF > DMF/H 2 O > CH 3 CN > CH 3 CN/H 2 O. DMF is an exceptional solvent because 3 of the 7 compounds undergo self-catalytic reaction. 9-Nitroanthracene, which has a perpendicular nitro group, is the fastest, while the more compact 1-nitropyrene and 3-nitrofluoranthene, are the slowest degrading compounds.

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