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
Photochromic Hydrazone Switches with Extremely Long Thermal Half-Lives.
TL;DR: Structural-property analysis shows that replacing the rotor pyridyl group of the typical hydrazone switch with a phenyl one leads to the long-lived negative photochromic compounds.
Journal ArticleDOI
Photoinduced Crystal-to-Liquid Phase Transitions of Azobenzene Derivatives and Their Application in Photolithography Processes through a Solid–Liquid Patterning
Yasuo Norikane,Emi Uchida,Satoko Tanaka,Kyoko Fujiwara,Emiko Koyama,Reiko Azumi,Haruhisa Akiyama,Hideyuki Kihara,Masaru Yoshida +8 more
TL;DR: A simple molecular design strategy for the phase transitions: azobenzenes having para-dialkoxy groups with a methyl group at the meta-position is reported, demonstrating the direct and reversible transformation of matter between the solid and liquid phases by light at constant temperature.
Journal ArticleDOI
Light: A Magical Tool for Controlled Drug Delivery.
TL;DR: The development of light‐responsive systems with a focus on recent advances, key limitations, and future directions is reviewed, in view of the increasing interest in on‐demand targeted drug delivery.
Journal ArticleDOI
Electrocatalytic Z → E Isomerization of Azobenzenes.
Alexis Goulet-Hanssens,Manuel Utecht,Dragos Mutruc,Evgenii Titov,Jutta Schwarz,Lutz Grubert,David Bléger,Peter Saalfrank,Stefan Hecht +8 more
TL;DR: The results show that the radical anion of the Z isomer is able to rapidly isomerize to the corresponding E configured counterpart with a dramatically enhanced rate as compared to the neutral species, implying that the metastable isomer of a photoswitch can be isomerized to the more stable one catalytically upon reduction, permitting the optimization of azobenzene switching in new as well as indirect ways.
Journal ArticleDOI
Two-photon neuronal and astrocytic stimulation with azobenzene-based photoswitches.
Mercè Izquierdo-Serra,Marta Gascón-Moya,Jan J. Hirtz,Silvia Pittolo,Kira E. Poskanzer,Eric Ferrer,Ramon Alibés,Félix Busqué,Rafael Yuste,Jordi Hernando,Pau Gorostiza +10 more
TL;DR: Two-photon excitation of azobenzene-based protein switches and versatile strategies to enhance their photochemical responses enables new applications to control the activation of neurons and astrocytes with cellular and subcellular resolution.
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.