SYNTHESIS AND OPTICAL PROPERTIES OF SUBSTITUTED 5,6,7,8-TETRAAZA-AZULENO[1,8-b,c]FLUORENES, SMALL ORGANIC MOLECULES OF UNUSUAL TOPOLOGY DESIGNED FOR CIRCULARLY POLARIZED LUMINESCENCE

Helical photoluminescent substituted 5,6,7,8-tetraaza-azuleno[1,8-b,c]fluorenes were obtained as racemates. The compounds have been designed for circularly polarized luminescence. Some of the compounds were separated on to enantiomers with chiral HPLC column and showed Cottons effects in absorption and emission spectra. The experimental results were compared with DFT calculations, which led us to assess the chirality to structure.