Synthesis, Characterization and Fluorescence Spectroscopy of Novel 3-(Substituted Ethenyl) Coumarins

Background: The reaction of 7-diethylamino 3-formyl coumarin with active methylene group afforded in good yields the corresponding new 3-(substituted ethenyl)coumarins. The structures of the synthesized compounds were confirmed by 1H NMR, 13C NMR spectral data, IR and elemental analysis. Optical properties were studied in dimethyl sulfoxide by UV/Vis absorption and fluorescence spectroscopy. Keywords: 7-diethylamino-3-formyl coumarin, active methylene group, ethenylcoumarin, fluorescence.