J. Rima, A. Ghauch, M. Martin-Bouyer
Dec 1, 1999
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Influential Citations
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Journal
Journal of Luminescence
Abstract
The fluorescence spectra of a number of 9-alkylphenanthrenes and 9-hexylpyrene crystals were studied. The 9-alkylphenanthrenes used for the present investigation included the following: 9-methylphenanthrene, 9-butylphenanthrene, and 9-hexylphenanthrene. Our studies revealed that the quasiline feature of spectra increase with increasing alkane chain length. The spectrum of 9-hexylphenanthrene crystal recorded at 4.2 K was quasilinear and strikingly similar to the spectrum of the dilute hexane solution of the same compound recorded at the same temperature. The correlation between increasing quasiline feature and increasing alkane chain length is attributed to the diminished interaction between polynuclear aromatic hydrocarbon (PAH) molecules. The fluorescence spectrum of 9-hexylpyrene suggested the disappearence of the pyrene excimer emission. This supports our postulate that the alkane chain has a profound effect in reducing the interaction between PAH molecules.