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- Title
Long‐Lived Supramolecular Helices Promoted by Fluorinated Photoswitches.
- Authors
Huang, He; Orlova, Tetiana; Matt, Benjamin; Katsonis, Nathalie
- Abstract
Abstract: Chiral azobenzenes can be used as photoswitchable dopants to control supramolecular helices in liquid crystals. However, the lack of thermal stability of the <italic>cis</italic>‐isomer precludes envisioning the generation of long‐lived supramolecular helices with light. Here, this study demonstrates thermally stable and axially chiral azobenzene switches that can be used as chiral dopants to create supramolecular helices from (achiral) nematic liquid crystals. Their <italic>trans</italic>‐to‐<italic>cis</italic> photoisomerization leads to a variation of helical twisting power that reaches up to 60%, and the helical superstructure that is engineered with light displays a relaxation time that reaches tens of hours. These results demonstrate that combining <italic>ortho</italic>‐fluorination with axial chirality in molecular photoswitches constitutes an efficient strategy to promote long‐lived helical states. Further, this approach shows potential to design supramolecular machines that are controlled by light entirely.
- Subjects
NEMATIC liquid crystals; THERMAL stability; SUPRAMOLECULAR polymers; AZOBENZENE derivatives; DOPING agents (Chemistry)
- Publication
Macromolecular Rapid Communications, 2018, Vol 39, Issue 1, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201700387