Figure-of-Eight Helicene Carbon Nanohoop with Möbius Topology

10 February 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


We present design and synthesis of a new class of chiral figure-of-eight carbon nanohoops by integrating [6]helicene into [7]cycloparaphenylene. The stereogenic [6]helicene unit endows the helicene carbon nanohoop with chiroptical properties and configurational stability typical for higher helicenes, while the presence of radially conjugated oligo-p-phenylene moiety provides the optoelectronic properties similar to meta[8]cycloparaphenylene, such as emission of visible light with a high quantum yield. We discovered that the synthesized helicene carbon nanohoop possesses a Mobius topology in solution and confirmed this hypothesis by variable-temperature 1H NMR spectroscopy and DFT calculations. Our results suggest that a single helicene stereogenic unit and high molecular strain are sufficient to induce Mobius topology in molecular nanocarbon systems.


Molecular nanocarbons
helicene molecules
Möbius structures


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.