Results 121 to 130 of about 33,034 (271)

INFLUÊNCIA DA RIGIDEZ DO MEIO NA CINÉTICA DO FOTOCROMISMO DE DITIZONATOS METÁLICOS

Química Nova
The kinetics of photoisomerization and thermal back reaction of mercury(II) and zinc(II) dithizonates, M(HDz)2, were analyzed by photolysis assays in fluid solution and in poly(methyl methacrylate), PMMA, films.
Cristiane Lázara de Barros, Newton Martins Barbosa Neto, Antonio Otavio T. Patrocinio   +2 more
doaj   +1 more source

A fluorophore attached to nicotinic acetylcholine receptor beta M2 detects productive binding of agonist to the alpha delta site [PDF]

, 2004
To study conformational transitions at the muscle nicotinic acetylcholine (ACh) receptor (nAChR), a rhodamine fluorophore was tethered to a Cys side chain introduced at the beta-19' position in the M2 region of the nAChR expressed in Xenopus oocytes ...
Auyeung, Vincent C., Bezanilla, Francisco, Chanda, Baron, Dahan, David S., Dibas, Mohammed I., Dougherty, Dennis A., Lester, Henry A., Petersson, E. James   +7 more
core  

Photoisomerization of a Fullerene Dimer

The Journal of Physical Chemistry C, 2008
A photo-switchable fullerene dimer and its analogous nitrogen endohedral species have been synthesized and characterized. Irradiation by ultraviolet and visible light has been used to switch between the trans and cis isomers of both the C60- and N@C60- based dimers.
Zhang, Jinying, Porfyrakis, Kyriakos, Morton, John J. L., Sambrook, Mark R., Harmer, Jeffrey, Xiao, Li, Ardavan, Arzhang, Briggs, G. Andrew D.   +7 more
openaire   +4 more sources

Synthesis of Dithienylcycloalkene Molecular Switches Enabled by a Bench‐Stable Ti‐Complex

Chemistry – A European Journal, EarlyView.
Herein we report a set of cycloalkene‐bridged DTEs with ring sizes ranging from 4‐ to 7‐membered rings. The synthesis of these analogs was performed via a key McMurry coupling step, which was enabled by a practical, bench‐stable Ti(IV)‐complex. Remarkably, it is shown that the strained cyclobutene bridge outperforms other rings, even the most commonly ...
Marcell M. Bogner, Márton Hegedűs, Péter P. Kalapos, Attila Kunfi, Gábor London   +4 more
wiley   +1 more source

History-dependent nano-photoisomerization by optical near-field in photochromic single crystals

Communications Materials
The history dependence of physical systems is promising for solving complex problems. To exploit spontaneous nanometre-scale optical memory for computation, the history dependence must be elucidated. Here, we demonstrate history-dependent or dynamic nano-
Yuji Arakawa, Kazuharu Uchiyama, Kingo Uchida, Makoto Naruse, Hirokazu Hori   +4 more
doaj   +1 more source

Anethole Isomerization and Dimerization Induced by Acid Sites or UV Irradiation

Molecules, 2010
The formation of cis-anethole and various dimers as a result of the exposure of trans-anethole to microporous solid acids (dealuminated HY zeolites), or UV-Vis irradiation was established by means of high resolution gas chromatography coupled to mass ...
Elena Stashenko, Jairo René Martínez, Hans T. Castro   +2 more
doaj   +1 more source

On the accuracy of retinal protonated Schiff base models

, 2018
We investigate the molecular geometries of the ground state and the minimal energy conical intersections (MECIs) between the ground and first excited states of the models for the retinal protonated Schiff base in the gas phase using the extended ...
Park, Jae Woo, Shiozaki, Toru
core   +2 more sources

Mechanism and Dynamics of Azobenzene Photoisomerization

Journal of the American Chemical Society, 2003
The excited-state dynamics of trans-azobenzene were investigated by femtosecond time-resolved photoelectron spectroscopy and ab initio molecular dynamics. Two near-degenerate pipi* excited states, S2 and S3,4, were identified in a region hitherto associated with only one excited state.
Schultz, Thomas, Quenneville, J, Levine, B, Toniolo, A, Martinez, TJ, Lochbrunner, S, Schmitt, M, Shaffer, JP, Zgierski, MZ, Stolow, A   +9 more
openaire   +4 more sources

Ambident Reactivity in the Phenyl + NO Radical Recombination

Chemistry – A European Journal, EarlyView.
ABSTRACT The recombination reaction of nitric oxide (NO) with radicals via its oxygen atom, rather than the more common nitrogen site, offers an intriguing pathway to the formation of oxynitrenes. The photochemical isomerization of nitroso compounds into their corresponding oxynitrenes may involve such a step.
Virinder Bhagat, Adrián Portela‐González, André K. Eckhardt, J. Philipp Wagner   +3 more
wiley   +1 more source

Generation of a Ground‐State Electron Donor Utilizing Stored Light Energy

Chemistry – A European Journal, EarlyView.
Chemically stored light energy enables the generation of dianion reductants (∼−2.7 V) from vicinal diols derived from diaryl ketone photodimerization. These ground‐state electron donors efficiently reduce challenging substrates at room temperature, including aryl bromides, alkyl iodides, and sulfonamides.
Marc Taillefer, Éric Clot, Alexis Prieto   +2 more
wiley   +1 more source