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Highly fluorescence, 3-(p-nitrophenyl)-7-diethylamino and 3-cyano-7-diethylaminocoumarin, iminocoumarins derivatives differing by the position of substituents and acceptors groups were investigated and characterized using 1H, 13C NMR and FT-IR spectroscopy analysis. These dyes were photophysically characterized and the effects of the substituents investigated. As a result, efficient charge transfer...