Pyrrolidylsubstituted Azadipyrromethene with Fully Chelated Boron Atom

A difluorosubstituted aza-boron-dipyrromethene derivative with fully chelated boron atom was synthesized by the reaction of BF3 center dot Et2O with 3,3,5,5-tetraarylazadipyrromethene, which was easily prepared from 1,3-diaryl-4-nitro-butan-1-one and ammonium acetate. One fluorine atom of the dye was substituted by pyrrolidine residue. This resulted in a significant bathochromic effect. Ultraviolet absorption and fluorescence emission spectra were recorded, and quantum yields of the obtained compounds were calculated.