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Issue 37, 2018
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ortho-Fluorination of azophenols increases the mesophase stability of photoresponsive hydrogen-bonded liquid crystals

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Abstract

Photoresponsive liquid crystals (LCs) whose alignment can be controlled with UV-Visible light are appealing for a range of photonic applications. From the perspective of exploring the interplay between the light response and the self-assembly of the molecular components, supramolecular liquid crystals are of particular interest. They allow elaborating the structure–property relationships that govern the optical performance of LC materials by subtle variation of the chemical structures of the building blocks. Herein we present a supramolecular system comprising azophenols and stilbazoles as hydrogen-bond donors and acceptors, respectively, and show that ortho-fluorination of the azophenol dramatically increases the thermal stability of the LC phases, an important characteristics in their further utilization in photonics. The systems exhibit fast photoinduced order–disorder transitions, and rapid recovery of the liquid-crystalline state once the light irradiation is ceased, due to the photochemical properties of azophenols.

Graphical abstract: ortho-Fluorination of azophenols increases the mesophase stability of photoresponsive hydrogen-bonded liquid crystals

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Publication details

The article was received on 28 May 2018, accepted on 29 Aug 2018 and first published on 30 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC02611D
Citation: J. Mater. Chem. C, 2018,6, 9958-9963
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    ortho-Fluorination of azophenols increases the mesophase stability of photoresponsive hydrogen-bonded liquid crystals

    M. Saccone, K. Kuntze, Z. Ahmed, A. Siiskonen, M. Giese and A. Priimagi, J. Mater. Chem. C, 2018, 6, 9958
    DOI: 10.1039/C8TC02611D

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