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π‑Extended C2‑Symmetric Double NBN-Heterohelicenes with Exceptional Luminescent Properties

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journal contribution
posted on 20.12.2019, 20:03 by Zuobang Sun, Chen Yi, Qifeng Liang, Chiranjeevi Bingi, Wenqing Zhu, Peirong Qiang, Dongqing Wu, Fan Zhang
Two novel B,N-embedded double heterohelicenes, Ph-NBNDH and Naph-NBNDH, with intensively twisted quasi-C2 symmetrical structures are synthesized for the first time via a highly regioselective intramolecular Scholl reaction. The π-extended skeletons render them with exceptional physical properties, such as the highest fluorescence quantum yields up to 0.83 among multiple helicenes. Moreover, the isolated (M,M)- and (P,P)-enantiomers of Naph-NBNDH deliver intense circularly polarized luminescence. As the emitting layer, Ph-NBNDH exhibits strong electroluminescence at high working voltage.