Journal ArticleDOI
Photoisomerization in different classes of azobenzene
TLDR
This critical review details the studies completed to date on the 3 main classes of azobenzene derivatives and explains the mechanism behind the isomerization mechanism.Abstract:
Azobenzene undergoes trans → cisisomerization when irradiated with light tuned to an appropriate wavelength. The reverse cis →transisomerization can be driven by light or occurs thermally in the dark. Azobenzene's photochromatic properties make it an ideal component of numerous molecular devices and functional materials. Despite the abundance of application-driven research, azobenzene photochemistry and the isomerization mechanism remain topics of investigation. Additional substituents on the azobenzene ring system change the spectroscopic properties and isomerization mechanism. This critical review details the studies completed to date on the 3 main classes of azobenzene derivatives. Understanding the differences in photochemistry, which originate from substitution, is imperative in exploiting azobenzene in the desired applications.read more
Citations
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Fast, light-responsive, metal-like polymer actuators generating high stresses at low strain
Rob C. P. Verpaalen,Shaji Varghese,Arne A. F. Froyen,Marina Pilz da Cunha,Maarten J. Pouderoijen,John Severn,Muhammad Rehan Asghar Bhatti,Ton Peijs,Cees W. M. Bastiaansen,Cees W. M. Bastiaansen,Michael G. Debije,Tom A. P. Engels,Tom A. P. Engels,Albertus P. H. J. Schenning +13 more
TL;DR: In this article, the photo-mechanical responses of ultra-drawn ultra-high molecular weight polyethylene (UHMWPE) actuators containing azobenzene photo-switches with symmetrically attached PE side chains are reported.
Journal ArticleDOI
A Straightforward Protocol for the Highly Efficient Preparation of Main-Chain Azo Polymers Directly from Bisnitroaromatic Compounds by the Photocatalytic Process
Laibing Wang,Xiangqiang Pan,Yin Zhao,Yang Chen,Wei Zhang,Yingfeng Tu,Zhengbiao Zhang,Jian Zhu,Nianchen Zhou,Xiulin Zhu +9 more
TL;DR: In this paper, the synthesis of main-chain Azo polymers directly from bisnitroaromatic compounds by the photocatalytic process has been achieved under mild conditions, which avoids the tedious synthesis of Azo monomers and proceeds with a high monomer conversion and excellent selectivity but without generating a significant amount of inorganic wastes and impurities.
Journal ArticleDOI
Photo-switched magnetic coupling in spin-crossover complexes.
TL;DR: The recent progress on the photoswitchable magnetic coupling in spin-crossover complexes reported by both the authors' group and other groups are discussed and the role of magnetic coupling is highlighted in determining their magnetic properties.
Journal ArticleDOI
Palladium-Catalyzed Oxidative Synthesis of Unsymmetrical Azophenols.
TL;DR: This study represents the first general method for the synthesis of o-hydroxyazobenzenes starting from simple azoarenes and tolerates various functional groups and allows the synthesisation of diverse unsymmetrical azophenols under mild conditions in good to excellent yields.
Journal ArticleDOI
Oxidative Dehydrogenative Couplings of Pyrazol-5-amines Selectively Forming Azopyrroles
TL;DR: New oxidative dehydrogenative couplings of pyrazol-5-amines for the selective synthesis of azopyrrole derivatives have been described and were employed by treatment with various terminal alkynes through Sonogashira cross-coupling leading to new azo compounds.
References
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Journal ArticleDOI
Photomechanics: directed bending of a polymer film by light.
TL;DR: It is shown that a single film of a liquid-crystal network containing an azobenzene chromophore can be repeatedly and precisely bent along any chosen direction by using linearly polarized light.
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Light-driven motion of liquids on a photoresponsive surface
TL;DR: The light-driven motion of a fluid substance in a surface-modified glass tube suggests potential applicability to microscale chemical process systems.
Journal ArticleDOI
Design and synthesis of chromophores and polymers for electro-optic and photorefractive applications
TL;DR: The ability of nonlinear optical materials to transmit, process and store information forms the basis of emerging optoelectronic and photonic technologies as discussed by the authors, where organic chromophore-containing polymers, in which the refractive index can be controlled by light or an electric field, are expected to play an important role.
Journal ArticleDOI
Ultrafast Dynamics of Photochromic Systems.
Naoto Tamai,Hiroshi Miyasaka +1 more
TL;DR: Reaction dynamics of the photochromic systems such as spiropyran, flugide and diarylethene derivatives in femto- to nano-second time region was reviewed and mechanisms of rapid reaction channels in various phases were discussed.