Aza[7]helicene Functionalized Triphenylmethyl Radicals with Circularly Polarized Doublet Emission (Advanced Optical Materials 4/2024)

Helicene Functionalized Trityl Radicals Trityl radicals are intrinsically chiral and the resolved enantiomeric propellers exhibit circularly polarized emission. However, due to the low inversion barrier, the trityl propellers are not stable and racemize quickly, inhibiting sustained circularly polarized fluorescence from these radical emitters. In article number 2301707, Alexander J. C. Kuehne, Prince Ravat and co-workers design helicene functionalized trityl radicals. The chiral helicene donor does not racemize at room temperature and the molecules exhibit superior circularly polarized emission brightness compared to other chiral radical emitters. [Image by Jo Richers Studio.]