Pick of the bunch: Banana-shaped molecules 1 and 2 containing dimethoxybenzene and pyridine units are highly efficient emitters of violet light despite the interruption of the π conjugation because of meta substitution. The contrasting solvent dependencies of the fluorescence quantum yield values of 1 and 2 are explained by the disparity between the difference density distributions in the excited states of the molecules.
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Yamaguchi et al. (2005) studied this question.
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