Ortho-Fluorination of azophenols increases the mesophase stability of photoresponsive hydrogen-bonded liquid crystals
Saccone, Marco; Kuntze, Kim; Ahmed, Zafar; Siiskonen, Antti; Giese, Michael; Priimagi, Arri (2018-01-01)
Saccone, Marco
Kuntze, Kim
Ahmed, Zafar
Siiskonen, Antti
Giese, Michael
Priimagi, Arri
01.01.2018
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201901111059
https://urn.fi/URN:NBN:fi:tty-201901111059
Kuvaus
Peer reviewed
Tiivistelmä
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.
Kokoelmat
- TUNICRIS-julkaisut [17116]