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
Gabriella Cavallo,Pierangelo Metrangolo,Pierangelo Metrangolo,Roberto Milani,Tullio Pilati,Arri Priimagi,Giuseppe Resnati,Giancarlo Terraneo +7 more
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
TL;DR: This review discusses the synthesis, switching conditions, and use of dynamic materials in which spiropyran has been attached to the surfaces of polymers, biomacromolecules, inorganic nanoparticles, as well as solid surfaces.
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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
The photoisomerization mechanism of azobenzene: a semiclassical simulation of nonadiabatic dynamics.
TL;DR: The photoisomerization dynamics of azobenzene is simulated, taking into account internal conversion and geometrical relaxation processes, by means of a semiclassical surface hopping approach and it is shown that in all cases the torsion around the N==N double bond is the preferred mechanism.
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Theoretical study of the isomerization mechanism of azobenzene and disubstituted azobenzene derivatives
TL;DR: A series of azobenzenes was studied using ab initio methods to determine the substituent effects on the isomerization pathways, and it is postulate that after n --> pi (S(1) <-- S(0)) excitation, the rotation mechanism dominates.
Journal ArticleDOI
Photochemical switching of polarization in ferroelectric liquid-crystal films
TL;DR: In this article, a photochemical process was used to induce spontaneous polarization switching in ferroelectric liquid crystals driven by photochemical processes, where the liquid-crystal films are doped with a photochromic compound which undergoes trans-cis isomerization on irradiation.
Journal ArticleDOI
Ultraviolet Spectra of Stilbene, p‐Monohalogen Stilbenes, and Azobenzene and the trans to cis Photoisomerization Process
TL;DR: In this paper, high resolution absorption and fluorescence spectra of the singlet-singlet transition in dilute mixed crystal have been analyzed, and from them it is estimated that the potential barrier to transcis isomerization in the first excited singlet state is about 40 kcal/mole.