Results 151 to 160 of about 78,896 (178)

Synthesis and spectroscopic investigation of directly azobenzene bridged diporphyrins

Tetrahedron, 1993
Abstract The synthesis of new directly azobenzene bridged diporphyrins is described. The spectroscopic properties of the new compounds are discussed.
Hermann K. Hombrecher, Kerstin Lüdtke
openaire   +1 more source

Protonation-Enhanced Antiferromagnetic Couplings in Azobenzene-Bridged Diradicals

The Journal of Physical Chemistry C, 2017
Proton-induced magnetic enhancement in an organic diradical is an appealing phenomenon. Here, taking two nitroxide groups as spin sources, we predict the magnetic properties of the trans and cis forms of azobenzene (AB)-bridged diradicals in which the central −N═N– unit can undergo single protonation to convert to its protonated counterpart or vice ...
Fengying Zhang, Xinyu Song, Yuxiang Bu
openaire   +1 more source

ChemInform Abstract: PHOTORESPONSIVE COMPLEXATION OF METAL CATIONS WITH AN AZOBENZENE‐CROWN‐AZOBENZENE BRIDGE IMMOBILIZED IN POLYMER SUPPORTS

Chemischer Informationsdienst, 1982
AbstractDer Einfluß von Bestrahlung auf die Bindungsfähigkeit des an Polystyrol über p‐Chorrnethylgruppen gebundenen Crownethers (I) mit zwei Azobenzoleinheiten wird unter Verwendung von Cs‐p‐nitrobenzoat untersucht.
S. SHINKAI, H. KINDA, O. MANABE
openaire   +1 more source

Reversible fluorescence modulation through the photoisomerization of an azobenzene-bridged perylene bisimide cyclophane

Organic Chemistry Frontiers, 2021
An azobenzene-bridged perylene bisimide cyclophane was designed and synthesized, which showed reversible fluorescence intensity switching under light-irradiation due to cooperative adjustments of PBI–PBI and PBI–Azo interactions.
Guanghui Ouyang, David Bialas, Frank Würthner   +2 more
openaire   +1 more source

Magnetic-induced isomerization of paramagnetic bridged azobenzene derivatives with conjugated alkyl chains

SmartMat
AbstractInducing a reversible structural transformation in organic photochromophores under the effect of a magnetic field is challenging owing to their poor magnetic properties. Compared with common azobenzene materials, bridged azobenzene materials exhibit a considerable potential for rapid trans‐cis isomerization induced by an external magnetic field
Yiyu Feng, Wei Feng, Jing Ge
exaly   +2 more sources

A Visible Light Responsive Smart Covalent Organic Framework with a Bridged Azobenzene Backbone

Macromolecular Rapid Communications
AbstractCondensation of 3,3′‐diamino‐2,2′‐ethylene‐bridged azobenzene with 1,2,4,5‐tetrakis‐(4‐formylphenyl) benzene produces a visible light responsive porous 2D covalent organic framework, COF‐bAzo‐TFPB, with a large surface area, good crystallinity, and thermal and chemical stability.
Qian Tang, Cheng-Bin Gong
exaly   +3 more sources

Isomeric double decker porphyrins bridged by four azobenzene units

J. Chem. Soc., Chem. Commun., 1988
A novel macropentacyclic system (1) containing double layered porphyrin units which are bridged by four azobenzene links has been synthesized, two stable isomers being isolated, differing in spatial arrangement of the amide groups and azobenzene links; the complex formation of these compounds with zinc(II) is reported.
Karl Heinz Neumann, Fritz Vögtle
openaire   +1 more source

Photoresponsive ordered hybrid materials containing a bridged azobenzene group

J. Mater. Chem., 2005
This paper describes the synthesis of 4,4′-[(triisopropoxysilyl)propyloxy]azobenzene and the preparation of the ordered hybrid material containing the bridged azobenzene moieties within the framework by using the direct liquid crystal templating approach.
Eric Besson, Ahmad Mehdi, Dan A. Lerner, Catherine Reyé, Robert J. P. Corriu   +4 more
openaire   +1 more source

Anion-modulated photoswitching of a tetraurea-bridged azobenzene

Inorganic Chemistry Frontiers
This work reports a peripherally azobenzene-functionalized ortho -phenylene oligourea capable of overcoming steric limitations to assemble into stable, reversibly photoswitchable complexes with diverse anions.
Yue Wang, Yu Tao, Xu Lu, Chaochao Fan, Dan Zhang, Tian Wang, Shulei Feng, Wenyao Zhang, Chuandong Jia   +8 more
openaire   +1 more source

Enhanced photoswitching of bridged azobenzene studied by nonadiabatic ab initio simulation

The Journal of Chemical Physics, 2012
Photoisomerization of a bridged azobenzene derivative (AB-C2) is studied by nonadiabatic ab initio molecular dynamics simulation. The effect of the alkyl bridge linking the two phenyl rings on the Z → E and E → Z photoisomerization pathways and efficiencies is analyzed by detailed comparison to the unbridged parent compound. It is found that the bridge
Marcus, Böckmann, Nikos L, Doltsinis, Dominik, Marx   +2 more
openaire   +2 more sources