Results 141 to 150 of about 2,688 (181)

Photocontrolled extraction ability of azobenzene-bridged azacrown ether

Tetrahedron Letters, 1979
Abstract The extraction equilibrium of alkali metal salts between water and benzene with an azobenzene-bridged azacrown ether(I) is affected by photo(uv)-irradiation. This indicates that the binding ability of (I) can be controlled by photo-induced cis-trans isomerism of the azobenzene moiety.
Seiji Shinkai, Toshiyuki Ogawa, Takahiro Nakaji, Yumiko Kusano, Osamu Nanabe   +4 more
openaire   +3 more sources

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   +3 more sources

Self-Directed Assembly of Photoactive Hybrid Silicates Derived from an Azobenzene-Bridged Silsesquioxane

Journal of the American Chemical Society, 2002
Hybrid silicate materials derived from organo-bridged silsesquioxane precursors, RO3-Si-R'-Si-OR3, where R and R' are organic ligands, represent a remarkably diverse class of nanocomposites capable of forming both Si-O-Si and Si-C-Si bonds with molecular scale homogeneity.
Liu, N., Yu, Kui, Smarsly, B., Dunphy, D., Jiang, Y-B, Brinker, C.   +5 more
openaire   +4 more sources

Photoresponsive lower-rim azobenzene substituted and bridged calix[4]arenes

Journal of Photochemistry and Photobiology A: Chemistry, 2000
Abstract The doubly azobenzene-chain lower-rim substituted calix[4]arenes 6 – 9 were prepared, followed by the doubly bridged biscalix[4]arenes 10 and 11 . All are photoresponsive and detailed studies of the E⇌Z photoisomerization and the Z → E thermal isomerization in 6 and 10 were carried out using UV and 1 H NMR spectroscopic ...
Fritz Vögtle, Dirk Udelhofen, Sarah Abramson, Benzion Fuchs   +3 more
openaire   +3 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.
Liang Qiang, Hao Bai, Xin‐yi Li, Hai‐lin Yang, Cheng‐bin Gong, Qian Tang   +5 more
openaire   +4 more sources

Unraveling a Chemically Enhanced Photoswitch: Bridged Azobenzene

Angewandte Chemie International Edition, 2010
Boeckmann, Marcus, Doltsinis, Nikos L., Marx, Dominik   +2 more
openaire   +5 more sources

A Bridged Azobenzene Derivative as a Reversible, Light‐Induced Chirality Switch

Angewandte Chemie International Edition, 2010
Haberhauer, Gebhard, Kaliweit, Christine
openaire   +4 more sources

Azobenzene-bridged calix[8]arenes

Tetrahedron Letters, 2006
An azobenzene bridge was introduced into the lower (or smaller) rim of p-tert-butylcalix[8]arene (1) and 1,5-calix[8]crown-3 (2) to form 1,4-singly bridged (3) and 1,5:3,7-doubly bridged (4) calix[8]arene derivatives, respectively. Trans and cis isomers of conformationally rigid 4 were isolated.
G. M. L. Consoli, C. Geraci, P. Neri, BERGAMINI, GIACOMO, BALZANI, VINCENZO   +4 more
openaire   +4 more sources

Azobenzene‐Bridged Porphyrin Nanorings: Syntheses, Structures, and Photophysical Properties

Chemistry – A European Journal, 2015
AbstractAzobenzene‐bridged β‐to‐β and meso‐to‐meso porphyrin nanorings were successfully synthesized by a palladium‐catalyzed Suzuki–Miyaura coupling reaction in a logical synthesis. The dimeric structure was confirmed by XRD analysis. The azo linkages in di‐ and tetramers are in the all‐trans conformation, whereas in the trimers one azo linkage can be
Weiming, Huang, Seung-Kyu, Lee, Young Mo, Sung, Fulei, Peng, Bangshao, Yin, Ming, Ma, Bo, Chen, Shubin, Liu, Steven Robert, Kirk, Dongho, Kim, Jianxin, Song   +10 more
openaire   +3 more sources

Unusual photochemical dynamics of a bridged azobenzene derivative

The Journal of Chemical Physics, 2010
In a large-scale simulation study of ultrafast photochemical dynamics for an azobenzene compound with an additional ethylenic bridge we have found unexpected features: while the dynamics starting from the Z isomer follow a barrierless path with steep gradients, the dynamics starting from the E isomer proceed through a different conical intersection ...
CARSTENSEN O, SIELK J, SCHOENBORN J. B, GRANUCCI, GIOVANNI, HARTKE B.   +4 more
openaire   +2 more sources