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
Fast thermal cis–trans isomerization depending on pH and metal ions of water-soluble azobenzene derivatives containing a phosphate group
TL;DR: In this paper, the effect of the structure of the phosphate groups (the length and the position), pH, and metal ions on thermal cis-trans isomerization was investigated for water-soluble azobenzene derivatives.
Journal ArticleDOI
Photoisomerization of azobenzenes isolated in cryogenic matrices
TL;DR: Phototransformation was shown to be reversible and the forms could be interconverted by irradiation at different wavelengths, thus indicating that the matrix effects responsible for hindering the AB photoisomerization are essentially due to steric restrictions.
Journal ArticleDOI
Controlling Two-Photon Action Cross Section by Changing a Single Heteroatom Position in Fluorescent Dyes
Borys Ośmiałowski,Elizaveta F. Petrusevich,Magda A. Antoniak,Izabela Grela,Mohammed A Bin Jassar,Marcin Nyk,Josep M. Luis,Beata Jędrzejewska,Robert Zaleśny,Denis Jacquemin +9 more
TL;DR: The results demonstrate that the TPACS values can be fine-tuned by changing the position of a single heteroatom, which alters the fluorescence quantum yields without changing the intrinsic two-photon absorption cross section.
Journal ArticleDOI
Controlling liquid and liquid crystalline network formation by core-fluorination of hydrogen bonded supramolecular polycatenars
Mohamed Alaasar,Mohamed Alaasar,Jaques-Christopher Schmidt,Xiaoqian Cai,Feng Liu,Carsten Tschierske +5 more
TL;DR: In this article, a series of supramolecular photosensitive polycatenar mesogens formed by hydrogen bonding interaction between a taper shaped triple-chain benzoic acid as the hydrogen bond-donor and fluorinated azopyridines with only a single chain as hydrogen bond acceptors were characterized by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD).
Journal ArticleDOI
Azobenzene vs azopyridine and matrix molar masses effect on photoinduced phenomena
Karolina Bujak,Hanna Orlikowska,Anna Sobolewska,Ewa Schab-Balcerzak,Ewa Schab-Balcerzak,Henryk Janeczek,Stanislaw Bartkiewicz,Jolanta Konieczkowska +7 more
TL;DR: In this article, the effect of the presence of pyridine vs benzene structure in azochromophore on thermally driven cis-trans isomerization in a solid state is presented.
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.