Abstract

The S 1 (2 1A g) and S 2 (1 1B u) fluorescence intensities for diphenylhexatriene and diphenyloctatetraene in room temperature solvents with different polarizabilities have been analyzed quantitatively with a refined treatment. The coupling constants between the S 1 and S 2 states have been evaluated to be 140 and 90 cm −1 for diphenylhexatriene and diphenyloctatetraene, respectively. These values are compared with those obtained from the fluorescence quantum yields and lifetimes.

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