Synthesis and absorption properties of new yellow-green emitting benzo[de]isoquinoline-1,3-diones containing hindered amine and 2-hydroxyphenylbenzotriazole fragments

Two novel benzo[de]isoquinoline-1,3-dione yellow-green emitting fluorophores, containing both 2,2,6,6-tetramethylpiperidine and 2-(2-hydroxyphenyl)-benzotriazole stabilizer fragments have been synthesized for the first time by combination of benzotriazole UV absorber and HALS units in one fluorescent molecule. Their basic photophysical properties in solution have been determined and discussed. Photodegradation of the new fluorophores has been studied and compared to other similar fluorescent dyes, not containing either UV absorber or hindered amine fragment in their molecules as well as not containing both of them. Novel fluorophores showed the best photostability in solution, which might be caused by a possible “synergism” of two stabilizer fragments combined in one molecule, differing in their action.