Tuning the thermo- and mechanoresponsive behavior of luminescent cyclophanes
- Sagara, Yoshimitsu Research Institute for Electronic Science, Hokkaido University
- Weder, Christoph Adolphe Merkle Institute, University of Fribourg
- Tamaoki, Nobuyuki Research Institute for Electronic Science, Hokkaido University
-
2016
Published in:
- RSC Advances. - 2016, vol. 6, p. 80408
English
Many cyclophanes have been investigated in dilute solution, where their internal cavities are accessible for supramolecular interactions. However, their photophysical properties in the solid state remain largely unexplored. We here report a new mechano- and thermoresponsive luminescent cyclophane that is comprised of two 9,10-bis(phenylethynyl)anthracene moieties and features two hexaethylene glycol bridges. The compound was found to exhibit a nematic liquid-crystalline phase at elevated temperature. X-ray diffraction patterns confirm that thermal and mechanical treatments induce changes in the molecular assembly, which are the basis for the observed photoluminescent color variations. The stimuli-responsive behavior of the new compound is quite different from that of a previously reported cyclophane with similar structure but shorter bridges. Thus, merely changing the ring size is an effective tool to tailor the stimuli-responsiveness and the phase behaviour of luminescent cyclophanes.
- Faculty
- Faculté des sciences et de médecine
- Department
- AMI - Chimie des polymères et matériaux
- Language
-
- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
-
- RERO DOC 289070
- DOI 10.1039/C6RA18348D
- Persistent URL
- https://folia.unifr.ch/unifr/documents/305739
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