Phosphorescence spectra of acenaphthene,diphenyl, and carbazole

These spectra are for liquid-nitrogen temperature, the solvents being n-pentane, n-hexane, n-heptane, and n-octane. Each has a vibrational structure, the vibrational frequencies being independent of the solvent. Acenaphthene in pentane and octane gives 12 peaks corresponding to vibrational frequencies of 414, 630, 1152, 1409, and 1604 cm^–1, the last two being the strongest. Diphenyl in pentane and heptane gives gives 21 peaks; the strongest vibrations are 1610 and 1275 cm^–1, others being 1003, 320, and 735 cm^–1. Carbazole in pentane and hexane gives 15 peaks that fit the frequencies 750, 852, 1141, 1305, 1477, and 1605 cm^–1, the first and last being the strongest.