Absorption and fluorescence of donor‐substituted pyrylium compounds are studied in order to get information of the x‐ and y‐chromophore system and of the role of structural and solvent effects. The experimental results are in accordance with the assumption that the absorption and fluorescence behaviour can be rationalized in terms of intramolecular radiative and non‐radiative charge transfer (charge shift) processes.
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Haucke et al. (1992) studied this question.
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