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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Journal ArticleDOI
Transfer, Amplification, Storage and Complete Self-Recovery of Supramolecular Chirality in Achiral Polymer System
Wei Zhang,Tengfei Miao,Xiaoxiao Cheng,Haotian Ma,Zi-Xiang He,Zhengbiao Zhang,Nianchen Zhou,Xiulin Zhu +7 more
TL;DR: In this paper, the partially cross-linked azobenzene (Azo) units can be employed as the potential chiral trigger to fully heal the destroyed helical superstructure in a chiral nematic polymer system.
Journal ArticleDOI
Light-induced shape morphing of thin films
TL;DR: In this article, the authors introduce principles of shape morphing in these systems by considering the underlying physics of photoinduced stresses and how these have been used in recent literature, and provide a critical overview of the important design characteristics of both photochemical and photothermal system and offer the open opportunities and challenges in this rapidly growing field.
Journal ArticleDOI
Lichtgesteuerte dynamische Chiralitätsumkehr in funktionalen selbstorganisierten helikalen Überstrukturen
Hari Krishna Bisoyi,Quan Li +1 more
Journal ArticleDOI
A Versatile Approach for In Situ Monitoring of Photoswitches and Photopolymerizations
Neil D. Dolinski,Zachariah A. Page,Fabian Eisenreich,Fabian Eisenreich,Jia Niu,Stefan Hecht,Javier Read de Alaniz,Craig J. Hawker +7 more
TL;DR: In this article, a simple, inexpensive, and modular method to directly illuminate NMR samples for in-situ analysis of photochemical transformations is reported, and the versatility of this technique is demonstrated by analyzing the light-induced propagating front for small-molecule photoswitches and the kinetics of photocontrolled living radical polymerizations.
Journal ArticleDOI
Cooperative Switching in Nanofibers of Azobenzene Oligomers.
C. Weber,Tobias Liebig,Manuel Gensler,Anton Zykov,Linus Pithan,Jürgen P. Rabe,Stefan Hecht,David Bléger,Stefan Kowarik +8 more
TL;DR: It is demonstrated that multi-azobenzene oligomers can assemble to form robust supramolecular nanofibers in which they can be switched repeatedly between the E- and Z- configuration, demonstrating the great potential of coupling individual photochromic units for increasing their quantum efficiency in the solid state.
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.
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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.