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Asymmetric Triple Helical Nonbenzenoid Nanographenes with Controllable Helicene Lengths
Lin Yang1, Yucheng Yin2,3, Wenhui Niu1
1Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany.
Abstract:
Helical nanographenes (NGs) play a crucial role in the development of chiral nanomaterials due to their distinctive optoelectronic and chiroptical properties. Herein, we report the efficient synthesis of two unprecedented azulene-embedded asymmetric triple helical NGs (1 and 2) with controllable helicene subunit lengths and π-extension. The crystallographic analysis confirms their highly twisted and asymmetric geometries. Both compounds exhibit narrow and tunable optical energy gaps (1: 1.74 eV; 2: 1.63 eV), as determined by UV-vis absorption and cyclic voltammetry measurements. Moreover, the enantiomers of 1 display pronounced chiroptical activity with a gabs of up to 3.1 × 10-3.
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