Results 141 to 150 of about 78,896 (178)

Bidirectional Photocontrol of Peptide Conformation with a Bridged Azobenzene Derivative†

Angewandte Chemie - International Edition, 2012
It goes both ways: A thiol-reactive cross-linker based on a bridged azobenzene derivative permits photoreversible control of peptide conformation on irradiation with violet (407 nm) and green (500-550 nm) light (see picture) through isomerization of the cross-linker.
Alan J Lough, Subhas Samanta, Andrew Woolley   +2 more
exaly   +3 more sources

Synthesis and Characterization of an Azobenzene-Functionalized Ethene-Bridged PMO

Zeitschrift Fur Anorganische Und Allgemeine Chemie, 2014
Abstract The azobenzene‐functionalized ethene‐bridged periodic mesoporous organosilica (PMO) was synthesized in a three step process. After synthesizing the pure PMO the azobenzene switch was post synthetically grafted at the ethene bridge. The successful synthesis was verified by N2 sorption measurements, IR spectroscopy, elemental analysis, and solid
Leo van Wüllen, Wolfgang Bensch, Sabarinathan Venkatachalam   +2 more
exaly   +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

Comparative Studies of thetrans−cisPhotoisomerizations of Azobenzene and a Bridged Azobenzene

The Journal of Physical Chemistry A, 2010
Using density-functional-based molecular dynamics simulations, we have performed comparative studies of the trans-cis isomerizations of azobenzene and bridged azobenzene (B-Ab) 5,6-dihydrodibenzo[c,g][1,2]diazocine induced by nπ* electronic excitation.
Chen-Wei, Jiang, Rui-Hua, Xie, Fu-Li, Li, Roland E, Allen   +3 more
openaire   +2 more sources

A Visible‐Light‐Triggered Conformational Diastereomer Photoswitch in a Bridged Azobenzene

Chemistry – A European Journal, 2016
AbstractKetal‐substituted bridged azobenzenes have been synthesized; these display a symmetrical boat conformation with the ketal in pseudo‐equatorial positions. These bridged Z‐azobenzenes (Z1) readily photoisomerize to the E‐isomer as well as another Z‐conformer (Z2) with ketal function on the pseudo‐axial position upon irradiation at 406 nm. The two
Deo, Claire, Bogliotti, Nicolas, Métivier, Rémi, Retailleau, Pascal, Xie, Juan   +4 more
openaire   +3 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

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 ...
Benzion Fuchs, Sarah Abramson, Fritz Vogtle   +2 more
exaly   +2 more sources

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, Yumiko Kusano
exaly   +2 more sources

A photoresponsive azobenzene-bridged cubic silsesquioxane network

Journal of Sol-Gel Science and Technology, 2016
An azobenzene (AZO)-bridged cubic silsesquioxane network exhibiting reversible photoisomerization behavior in nonpolar solvents has been prepared via hydrosilylation reaction between 4,4′-diallyloxy-azobenzene and octahydridosilsesquioxane (H8Si8O12; H-POSS). Approximately 70 % of the corner Si–H groups of H-POSS are reacted to form a three-dimensional
Sufang Guo, Tatsuya Okubo, Kazuyuki Kuroda, Atsushi Shimojima   +3 more
openaire   +1 more source

Bridged Azobenzene Enables Dynamic Control of Through-Space Charge Transfer for Photochemical Conversion

The Journal of Physical Chemistry Letters, 2021
Through-space charge transfer (TSCT) has become a thriving strategy of modulating photogenerated charges in organic photoresponsive molecular systems for potential applications in luminescence, optoelectronics, and photochemical conversion. Yet fixed configuration between electron donor (D) and acceptor (A) is disadvantageous to mitigate charge ...
Huiting Zhou, Fuxiang He, Yuanyuan Chong, Lixin He, Jun Jiang, Yi Luo, Guozhen Zhang   +6 more
openaire   +2 more sources