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
Taking Photochromism beyond Visible: Direct One-Photon NIR Photoswitches Operating in the Biological Window.
TL;DR: A general design strategy has been devised and a dihydropyrene derivative is described here that displays negative T-type photochromism, allowing for efficient and nearly quantitative switching induced by NIR light λ>800 nm.
Journal ArticleDOI
The absorption spectrum of cis-azobenzene
TL;DR: Three methods were used and the method based on the subtraction of derivative spectra coupled with a global analysis of the spectra recorded during thermal cis-trans isomerization is shown to give slightly more reliable results than the method using isomeric ratios determined by 1H-NMR.
Journal ArticleDOI
Light-driven molecular trap enables bidirectional manipulation of dynamic covalent systems.
Michael Kathan,Fabian Eisenreich,Christoph Jurissek,André Dallmann,Johannes Gurke,Stefan Hecht +5 more
TL;DR: This work demonstrates how light can selectively drive and control the reversible reaction between a nitrogen nucleophile and a photoswitchable carbonyl electrophile by inducing wavelength-specific tautomerization cycles, which enables external and bidirectional regulation of closed dynamic covalent systems via C=N exchange.
Journal ArticleDOI
Reversible redox chemistry in azobenzene-based organic molecules for high-capacity and long-life nonaqueous redox flow batteries.
Leyuan Zhang,Yumin Qian,Ruozhu Feng,Yu Ding,Xihong Zu,Changkun Zhang,Xuelin Guo,Wei Wang,Guihua Yu +8 more
TL;DR: In this paper, azobenzene-based organic compounds are introduced as new active materials to realize high-performance nonaqueous RFBs with long cycling life and high capacity, achieving a stable long cycling with a low capacity decay of 0.014% per cycle and 0.16% per day over 1000 cycles.
Journal ArticleDOI
Toward Photopharmacological Antimicrobial Chemotherapy Using Photoswitchable Amidohydrolase Inhibitors.
Claire E. Weston,Andreas Krämer,Felix Colin,Özkan Yildiz,Matthias G. J. Baud,Franz-Josef Meyer-Almes,Matthew J. Fuchter +6 more
TL;DR: Protein-ligand crystal structures of the E-isomers of both an azobenzene and an arylazopyrazole inhibitor, bound to bacterial histone deacetylase-like amidohydrolases (HDAHs), reveal conformational differences between the two photoswitch inhibitor classes and may pave the way for the design of improved photopharmacological agents targeting the HDAC superfamily.
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.