7:8,9:10-Dibenzo-1,2,3,4-tetrafluoro- triphenylene: Synthesis, Structure, and Photophysical Properties of a Novel [5]Helicene

A simple and efficient synthesis and crystallographic analysis of the partially fluorinated 7:8,9:10-dibenzo-1,2,3,4-tetrafluorotriphenylene, 1, in 59% yield is reported. Compound 1 is a blue luminescent [5]helicene in both solution
and the solid state. It spontaneously forms enantiomorphous
single crystals from racemic samples and exhibits slipped,
face-to-face F···Cπ contacts within the stacks of molecules.