Synthesis, absorption, and fluorescence properties and crystal structures of 7-aminocoumarin derivatives

Among several newly synthesized coumarins are 7-pyrrolyl coumarins and carbazole-coumarin hybrids (2-pyranone-condensed carbazoles). Their spectral properties and crystal structures are discussed by comparing with those of related 7-aminocoumarin derivatives. Carbazole-coumarin hybrids exhibit absorption properties common to those of 7-aminocoumarins and simple carbazoles.