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
The Halogen Bond
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TL;DR: The specific advantages brought up by a design based on the use of the halogen bond will be demonstrated in quite different fields spanning from material sciences to biomolecular recognition and drug design.
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Artificial Molecular Machines
TL;DR: The latest generations of sophisticated synthetic molecular machine systems in which the controlled motion of subcomponents is used to perform complex tasks are discussed, paving the way to applications and the realization of a new era of “molecular nanotechnology”.
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Spiropyran-based dynamic materials
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Stimuli-responsive supramolecular polymeric materials.
TL;DR: This critical review of recent developments in supramolecular polymeric materials is addressed, which can respond to appropriate external stimuli at the fundamental level due to the existence of noncovalent interactions of the building blocks.
References
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Journal ArticleDOI
Triplet state 1- and 2-fold cis-trans isomerization of bis(styryl)arenes - balance between diabatic and adiabatic mechanisms
TL;DR: In this article, the triplet-sensitized cis-trans photoisomerization of three bisstyrylarenes, 1-3, has been studied by quantum yield measurements and laser flash photolysis.
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Study of the non-covalent interactions in Langmuir–Blodgett films: An interplay between π−π and dipole–dipole interactions
Zhexiong Tang,Malkiat S. Johal,Paul H. Scudder,Nina G. Caculitan,Rudolph J. Magyar,Sergei Tretiak,Hsing-Lin Wang +6 more
TL;DR: In this article, the authors describe Langmuir-Blodgett (L-B) monolayer and multilayer assemblies constructed from a series of NLO-active azo-benzene derivatives possessing terminal moieties of variable dipole moment and show that the interplay between two dominant noncovalent interactions within the assemblies, namely dipolar and π−π stacking interactions, dictate the packing density, structural order, as well as the electronic properties of the final films.
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Photoinduced fluorescence changes on E–Z isomerisation in azobenzene derivatives
TL;DR: In this paper, the first reported examples of fluorescence enhancement on E→Z isomerisation across a NN bond were reported, and the origin of the enhancement in the cis isomer was explained on the basis of the inhibition of photoinduced electron transfer due to the nonplanar geometry of this isomer, which reduces the effective conjugation of the nitrogen lone pair electrons with the π electrons of the fluorophore.
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Laser flash photolysis study of substituted azobenzenes. Evidence for a triplet state in viscous media
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Synthesis and properties of azobenzocrown ethers with π-electron donor, or π-electron donor and π-electron acceptor group(s) on benzene ring(s)
TL;DR: In this article, a 19-membered crown ether with 4-dimethylamino-4′-nitroazobenzene fragment has been solved, and its metal ion complexation abilities in solution were studied using UV-vis spectrophotometry.