Study of prototropic reactions of indole chalcone derivatives in ground and excited states using absorption and fluorescence spectroscopy

A novel fluorescent probe of alkyne compounds for putrescine detection based on click reaction

“…The N atom in the DMF molecule may have some inuence on DPY, resulting in a signicant quenching of the uorescence. 30 In MeOH and EtOH, the uorescence intensity of DPY was also signicantly lower than that of other solvents, and the reason was that the energy loss generated by uorescence emission which would be further increased due to the hydrogen bonds between the solute and the solvent in the polar protic solvent. This resulted in the uorescence intensity decrease and a red-shi in the emission spectrum.…”