The Temperature Dependence of Fluorescence of Dibenzoanthrones |
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Authors: | Shigeru Ohshima Akira Uchida Isao Oonishi Shoji Fujisawa |
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Affiliation: | 1. Departments of Biomolecular Science and Chemistry , Faculty of Science, Toho University , Miyama 2–2–1, Funabashi, Chiba, 274, Japan;2. Chemistry, Faculty of Science, Toho University , Miyama 2–2–1, Funabashi, Chiba, 274, Japan |
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Abstract: | The fluorescence spectra of three isomeric dibenzoanthrones, 13H-dibenzoa, de]anthracen-13-one (1), 13H-benzohi]chrysen-13-one (2), and 7H-dibenzoa, kl]anthracen-7-one (3), in an ethanol-ethertoluene mixed solution were measured as a function of the sample temperature (T). The three molecules provided individual T-dependences of fluorescence spectra. The spectra of 1 changed usually; as T was decreased, they were intensified, showing a vibrational structure more clearly. 2 fluoresced very weakly and the spectra were almost insensitive to T; it also phosphoresced at low temperatures. The spectra of 3 exhibited only a broad band and, strangely enough, it was reduced with decreasing T. The peculiar T-dependence of the fluorescence spectra of 2 and 3 was explained in terms of the results obtained by molecular orbital calculations. |
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Keywords: | dibenzoanthrones temperature dependence fluorescence distortion molecular orbital calculation |
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