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Article 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 ( and ) 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 (: 1.74 eV; : 1.63 eV), as determined by UV-vis absorption and cyclic voltammetry measurements. Moreover, the enantiomers of display pronounced chiroptical activity with a of up to 3.1 × 10.
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| http://dx.doi.org/10.1021/acs.orglett.5c03372 | DOI Listing |
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