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Mechanoresponsive luminescence and liquid-crystalline behaviour of a cyclophane featuring two 1,6-bis(phenylethynyl)pyrene groups
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| Title: | Mechanoresponsive luminescence and liquid-crystalline behaviour of a cyclophane featuring two 1,6-bis(phenylethynyl)pyrene groups |
| Authors: | Sagara, Yoshimitsu Browse this author | | Tamaoki, Nobuyuki Browse this author →KAKEN DB |
| Issue Date: | 17-Nov-2017 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | RSC advances |
| Volume: | 7 |
| Issue: | 74 |
| Start Page: | 47056 |
| End Page: | 47062 |
| Publisher DOI: | 10.1039/c7ra10776e |
| Abstract: | Cyclophanes have been attractive targets over recent decades because of their fascinating molecular structures and inherent ability to act as supramolecular hosts. However, cyclophanes that exhibit stimuli-responsive luminescence in their condensed states are still very rare, although luminescent cyclophanes could be suitable platforms for sophisticated photofunctional molecular assembled materials. We here report that a pyrenophane featuring two p-extended pyrene groups exhibits mechanoresponsive luminescence in the solid states and shows a nematic liquid-crystalline phase at elevated temperature. Two 1,6-bis(phenylethynyl)pyrene moieties form intramolecular excimers in a diluted chloroform solution, whereas no clear intra-and/or intermolecular excimer formation was observed for the solid state accessed through slow cooling from the nematic phase. Photoluminescence spectroscopic measurements, emission lifetime measurements, and X-ray diffraction patterns confirmed that mechanical stimuli result in conversion to much less ordered molecular assembled states in which some luminophores form excimers, leading to changes in photoluminescence colours. |
| Rights: | https://creativecommons.org/licenses/by-nc/3.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/67616 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 相良 剛光
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