Donor-Acceptor Type [5]Helicene Derivative with Strong Circularly Polarized Luminescence

Circularly polarized luminescence (CPL) of unsubstituted helicenes is weak due to their low fluorescence quantum yield (Φf) and small dissymmetry factor (gCPL). In this study, we designed synthesized a donor-acceptor type [5]helicene, 5,10-dicyano-2,13-bis(3,4,5-tris(n-octyloxy)phenyl)[5]helicene. This helicene showed high (Φf = 0.63) good |gCPL| (4.2 × 10−3) symmetry-allowed transition its helical structure. Moreover, the solvatofluorochromism while maintaining gCPL. 5,10-dicyano-2,13-bis(3,4,5-tris(octyloxy)phenyl)[5]helicene.