Vibrational Analysis of Electronic Transition Bands of Coronene

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Abstract
The fluorescence and absorption spectra of coronene dissolved in organic solvents were measured at room temperature. Their vibrational structures were analyzed by reference to the Raman lines of crystalline coronene measured by means of a He-Ne gas laser, and the observed transition energies were compared with the calculated ones. It was suggested that the p-band of the absorption spectrum of coronene (23000–27000 cm−1) is composed of more than one electronic transition, in contrast with the case of benzene. The fluorescence and phosphorescence spectra of coronene in n-octane were also measured at 77°K, and their vibrational structures were successfully analyzed with some perturbing vibrations and a few totally-symmetric ones.