Double π‐Extended Undecabenzo[7]helicene
This work reports the first double π‐extended undecabenzo[7]helicene 1, which is a large chiral nanographene, composed of 65 fused rings and 186 conjugated carbon atoms. The molecular identity of 1 has been confirmed by single crystal X‐ray diffraction. A wine coloured solution of 1 in dichlorometha...
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Published in | Angewandte Chemie International Edition Vol. 60; no. 14; pp. 7796 - 7801 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Wiley
29.03.2021
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Subjects | |
Online Access | Get full text |
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Summary: | This work reports the first double π‐extended undecabenzo[7]helicene 1, which is a large chiral nanographene, composed of 65 fused rings and 186 conjugated carbon atoms. The molecular identity of 1 has been confirmed by single crystal X‐ray diffraction. A wine coloured solution of 1 in dichloromethane absorbs light from ultraviolet to the near infrared, featuring an extremely large molar absorption coefficient of 844 000 M−1 cm−1 at 573 nm. Optically pure 1 shows a record high electronic circular dichroism intensity in the visible spectral range (|Δϵ|=1375 M−1 cm−1 at 430 nm) known for any discrete polycyclic aromatic hydrocarbon. These unusual photophysical properties of 1 contrast sharply with those of a mono‐undecabenzo[7]helicene derivative 2.
More than double: This paper presents the first double π‐extended undecabenzo[7]helicene. It is a chiral nanographene, displaying an extremely strong light absorption capability with a record high ECD intensity in the visible spectral range known for any discrete PAH compound. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 |
DOI: | 10.1002/anie.202014621 |