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Chirality Amplified: Long, Discrete Helicene Nanoribbons

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c11260· OSTI ID:2202964
 [1];  [2];  [3];  [4];  [4];  [5];  [4];  [6];  [4];  [4]
  1. Columbia University, New York, NY (United States); Columbia University
  2. Columbia University, New York, NY (United States); University of Copenhagen (Denmark)
  3. Universidad de Malaga (Spain); Istituto di Chimica dei Composti Organo Metallici (ICCOM-CNR), Pisa (Italy)
  4. Columbia University, New York, NY (United States)
  5. University of Copenhagen (Denmark)
  6. Istituto di Chimica dei Composti Organo Metallici (ICCOM-CNR), Pisa (Italy)

Here we report the synthesis of two polyhelicene frameworks consisting, from end-to-end, of 18 and 24 fused benzene rings. The latter exhibits the largest electronic circular dichroism in the visible spectrum of any molecule. These shape-persistent helical nanoribbons incorporate multiple helicenes, a class of contorted polycyclic aromatic molecules consisting of ortho-annulated rings. These conjugated, chiral molecules have interesting chemical, biological, and chiroptical properties; however, there are very few helicenes with extraordinary chiroptical response over a broad range of the visible spectrum—a key criterion for applications such as chiral optoelectronics. In this report, we show that coupling the polyhelicene framework with multiple perylene-diimide subunits elicits a significant chiroptic response. Notably, the molar circular dichroism increases faster than the absorptivity of these molecules as their helical axis lengthens. Computational analysis reveals that the greatly amplified circular dichroism arises from exciton-like interactions between the perylene-diimide and the helicene moieties. As a result, we predict that even greater chiroptic enhancement will result from further axial elongation of these nanoribbons, which can be readily enabled via the iterative synthetic method presented herein.

Research Organization:
Columbia University, New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. National Institutes of Health
Grant/Contract Number:
SC0019440
OSTI ID:
2202964
Alternate ID(s):
OSTI ID: 1853250
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 2 Vol. 143; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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