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Synthesis of Highly Luminescent Chiral Nanographene

2022; Wiley; Volume: 62; Issue: 4 Linguagem: Inglês

10.1002/anie.202215367

1521-3773

Jikun Li, Xing‐Yu Chen, Wenlong Zhao, Yunlong Guo, Yi Zhang, Xinchang Wang, Andrew C.‐H. Sue, Xiaoyu Cao, Meng Li, Chuan‐Feng Chen, Xiaoye Wang,

Porphyrin and Phthalocyanine Chemistry

Chiral nanographenes with both high fluorescence quantum yields (ΦF ) and large dissymmetry factors (glum ) are essential to the development of circularly polarized luminescence (CPL) materials. However, most studies have been focused on the improvement of glum , whereas how to design highly emissive chiral nanographenes is still unclear. In this work, we propose a new design strategy to achieve chiral nanographenes with high ΦF by helical π-extension of strongly luminescent chromophores while maintaining the frontier molecular orbital (FMO) distribution pattern. Chiral nanographene with perylene as the core and two dibenzo[6]helicene fragments as the wings has been synthesized, which exhibits a record high ΦF of 93 % among the reported chiral nanographenes and excellent CPL brightness (BCPL ) of 32 M-1 cm-1 .