A fan-shaped synthetic chiral nanographene

We report the synthesis and characterization of a fan-shaped chiral nanographene 1, which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon atoms. In the dehydrocyclization reaction, 38 C -C bonds are formed simultaneously. 1 exhibits strong panchromatic absorption from the ultraviolet to the near-infrared, with an absorption coefficient of 209,0 0 0 L mol -1 cm -1 at 564 nm. Optically pure samples, obtained via chiral HPLC, show distinct ECD signals (|A8| = 704 L mol -1 cm -1 at 405 nm). Upon excitation, 1 emits near-infrared fluorescence at 820 nm with a quantum yield of 5.5%. These photophys-ical properties of 1 were analyzed with the assistance of DFT calculations.(c) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of MateriaMedica, Chinese Academy of Medical Sciences.

Automated summary

We report the synthesis and characterization of a fan-shaped chiral nanographene 1, which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon atoms. The synthesized nanographene exhibits strong panchromatic absorption and near-infrared fluorescence emissions. The optical properties were analyzed through DFT calculations.