Synthesis and Characterization of Hexapole [7]Helicene, A Circularly Twisted Chiral Nanographene.

['Zhu Y', 'Xia Z', 'Cai Z', 'Yuan Z', 'Jiang N', 'Li T', 'Wang Y', 'Guo X', 'Li Z', 'Ma S', 'Zhong D', 'Li Y', 'Wang J']
J Am Chem Soc. 2018 Mar 14. doi: 10.1021/jacs.8b01447. [Epub ahead of print]

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Abstract
['We report the synthesis and characterization of two hexapole [7]helicenes (H7Hs). Single crystal X-ray diffraction unambiguously confirms the molecular structure. H7H absorbs light, with distinct Cotton effect, from ultraviolet to the near infrared (λmax = 618 nm). Cyclic voltammetry reveals nine reversible redox states, consecutively from -2 to +6. These chiroptical and electronic properties of H7H are inaccessible from helicene's small homologues.']