Azopyridine : a smart photo- and chemo-responsive substituent for polymers and supramolecular assemblies

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http://hdl.handle.net/10138/320455

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Ren , H , Yang , P & Winnik , F M 2020 , ' Azopyridine : a smart photo- and chemo-responsive substituent for polymers and supramolecular assemblies ' , Polymer Chemistry , vol. 11 , no. 37 , pp. 5955-5961 . https://doi.org/10.1039/d0py01093f

Title: Azopyridine : a smart photo- and chemo-responsive substituent for polymers and supramolecular assemblies
Author: Ren, Hao; Yang, Peng; Winnik, Francoise M.
Contributor: University of Helsinki, Polymers
Date: 2020-10-07
Language: eng
Number of pages: 7
Belongs to series: Polymer Chemistry
ISSN: 1759-9954
URI: http://hdl.handle.net/10138/320455
Abstract: Azo dyes, such as azobenzene, are able to convert absorbed light into motion or deformation on the macroscopic scale on the basis of their remarkable ability to undergo repeatedly and in 100% yield reversibletrans-to-cisphotoisomerization. Current needs for multiresponsive and fast photoswitches have led to the development of heteroaryl azo dyes, such as azopyridine. This remarkable azo compound combines the photoresponse of the azo chromophore with the chemistry of the pyridine ring, in particular its responsiveness to changes in pH and its ability to form hydrogen- and halogen-bonds. This mini-review summarizes key features of the photoisomerization of polymer-tethered azopyridine in aqueous media and describes a few recent research accomplishments in emerging areas that have benefited of the fast thermalcis-to-transrelaxation characteristics of azopyridinium or H-bonded azopyridine. It also discusses the effects of the photoisomerization of azopyridine on the thermoresponsive properties of azopyridine-tethered heat-sensitive polymers. Overall, azopyridine is a highly versatile actuator to consider when designing photo/multiresponsive polymeric materials.
Subject: CIS-TRANS-ISOMERIZATION
LIQUID-CRYSTALLINE POLYMER
BLOCK-COPOLYMERS
AZOBENZENE
LIGHT
FABRICATION
BEHAVIOR
PH
DRIVEN
PNIPAM
116 Chemical sciences
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