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
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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
2‐Hydroxyazobenzenes to Tailor pH Pulses and Oscillations with Light
Matthieu Emond,Thomas Le Saux,Sylvie Maurin,Jean-Bernard Baudin,Raphaël Plasson,Ludovic Jullien +5 more
TL;DR: This paper evaluates the 2-hydroxyazobenzene platform for tailoring proton concentration pulses and oscillations with monochromatic light and finds that up to 2 units of reversible pH drops or pH oscillations on the 10 s timescale have been obtained by appropriately tailoring single-wavelength illumination of 2-Hydroxyazabenzene solutions.
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Theoretical description of the diimide molecule
TL;DR: In this paper, Hartree-Fock and multiconfiguration calculations were carried out to determine the mechanism for isomerization and the lowest energy path for the N2H2 molecule was found by inversion about one nitrogen (rather than rotation about the NN bond).
Journal ArticleDOI
Quantum Organic Photochemistry. IV. The Photoisomerization of Diimide and Azoalkanes
TL;DR: In this article, the potential energy surfaces for the isomerization of diimide and azomethane in the ground, 1(n,π*), 3 (nπ,π*) and 3 (π, π*) states have been calculated by ab initio molecular orbital methods.
Journal ArticleDOI
UV−Vis, NMR, and Time-Resolved Spectroscopy Analysis of Photoisomerization Behavior of Three- and Six-Azobenzene-Bound Tris(bipyridine)cobalt Complexes
TL;DR: The photoisomerization properties of tris(bipyridine)cobalt complexes containing six or three azobenzene moieties, namely, [Co(II)(dmAB)3](BF4)2], suggested that the cis isomer ratio in the photostationary state upon irradiation at 365 nm is controlled not by the number of azobenzenes in one molecule but rather by the oxidation state of the cobalt ions.
Journal ArticleDOI
Photoisomerization of azobenzocrown ethers. Effect of complexation of alkaline earth metal ions
TL;DR: In this paper, the effects of complexed metal ions on trans−cis photoisomerization reactions of two azobenzene compounds having a crown ether ring, 1a (small ring) and 1b (large ring) were investigated.