Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 45, Pages 14782-14786Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808178
Keywords
circularly polarized luminescence; helicenes; nanostructures; nonlinear optics; photophysics
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [ERC-2015-STG-677023]
- Ministerio de Economia y Competitividad (Spain) [CTQ2015-70283-P, BES-2016-076371, RyC-2013-12943]
- Fundacao para a Ciencia e a tecnologia [UID/NAN/50024/2013, IF/00759/2013]
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The synthesis and characterization of an enantiopure superhelicene nanographene is reported in which two saddle-shaped and one planar hexabenzocoronene (HBC) units are arranged in a helicoidal shape to form an undecabenzo[7]carbohelicene. The described compound is the first fully pi-extended [7]helicene. Racemic resolution of the helical nanographene permitted analysis of the chiroptical properties and revealed dissymmetry factors in the range of 2 x 10(-3) both in the absorption and in the emission measurements. Remarkably, non-linear photophysical analysis demonstrated a two-photon absorption cross-section of 870 GM at 800 nm and a perfect overlap between linear, non-linear, and chiral emissions.
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