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Issue 84, 2016
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Tuning the thermo- and mechanoresponsive behavior of luminescent cyclophanes

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Abstract

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.

Graphical abstract: Tuning the thermo- and mechanoresponsive behavior of luminescent cyclophanes

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Publication details

The article was received on 19 Jul 2016, accepted on 15 Aug 2016 and first published on 26 Aug 2016


Article type: Paper
DOI: 10.1039/C6RA18348D
Citation: RSC Adv., 2016,6, 80408-80414
  • Open access: Creative Commons BY license
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    Tuning the thermo- and mechanoresponsive behavior of luminescent cyclophanes

    Y. Sagara, C. Weder and N. Tamaoki, RSC Adv., 2016, 6, 80408
    DOI: 10.1039/C6RA18348D

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