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
Modified Electrodes and Electrochemical Systems Switchable by Temperature Changes
TL;DR: In this paper, an overview of extensive research efforts in the area of temperature-controlled electrochemical systems is presented, which is achieved by modification of electrode surfaces with thermo-sensitive polymers (e.g., poly(N-isopropylacrylamide), PNIPAM) which are reversibly switched by temperature changes between two different structures: swollen expanded coil conformation and shrunken collapsed globule state.
Journal ArticleDOI
Azobenzene Photoisomerization-Induced Destabilization of B-DNA
Mithun Biswas,Irene Burghardt +1 more
TL;DR: The conformational response of DNA upon azobenzene binding and isomerization is investigated, using a threoninol linker that has been experimentally investigated recently and nonequilibrium molecular dynamics simulations are carried out using a switching potential describing the photoinduced isomersization.
Journal ArticleDOI
A new room temperature dark conglomerate mesophase formed by bent-core molecules combining 4-iodoresorcinol with azobenzene units.
TL;DR: The first bent-core molecules comprising 4-iodoresorcinol as the central core unit and incorporating azobenzene units have been synthesized and a new type of dark conglomerate phase (DC phase) is observed, which remains over a wide temperature range down to room temperature without crystallization.
Journal ArticleDOI
Isomer Dependence on the Reactivity of Diazenes with Pentaphenylborole
TL;DR: Reactions of the anti-aromatic pentaphenylborole with diazenes indicate that both the substitution and the isomer influence the reaction outcome, and the more aromatic pyridazine proved to be less reactive, forming a resilient adduct.
Journal ArticleDOI
Cross-Coupling Strategy for the Synthesis of Diazocines.
TL;DR: This work presents a new synthetic strategy that is both versatile and reliable, and starting from widely available 2-bromobenzyl bromides, the designated molecules can be obtained in three simple steps.
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.