Results 31 to 40 of about 7,808 (189)

Thermally Activated Paramagnets from Diamagnetic Polymers of Biphenyl-3,5-diyl Bis(tert-butyl Nitroxides) Carrying Methyl and Fluoro Groups at the 2’- and 5’-Positions

Crystals, 2016
Three new biradicals—2’,5’-dimethyl-, 2’-fluoro-5’-methyl-, and 5’-fluoro-2’-methyl- biphenyl-3,5-diyl bis(tert-butyl nitroxides)—were synthesized. The magnetic susceptibility measurements revealed their diamagnetism below and around room temperature ...
Toru Yoshitake, Hiroki Kudo, Takayuki Ishida   +2 more
doaj   +1 more source

Modulation of the Human Erythrocyte Antioxidant System by the 5- and 6-Membered Heterocycle-Based Nitroxides

Molecules
Nitroxides are stable radicals consisting of a nitroxyl group, >N-O•, which carries an unpaired electron. This group is responsible for the paramagnetic and antioxidant properties of these compounds.
Krzysztof Gwozdzinski, Stella Bujak-Pietrek, Anna Pieniazek, Lukasz Gwozdzinski   +3 more
doaj   +1 more source

gem‐Diethyl Pyrroline Nitroxide Spin Labels: Synthesis, EPR Characterization, Rotamer Libraries and Biocompatibility

ChemistryOpen, 2019
The availability of bioresistant spin labels is crucial for the optimization of site‐directed spin labeling protocols for EPR structural studies of biomolecules in a cellular context.
Dr. Stephanie Bleicken, Tufa E. Assafa, Dr. Hui Zhang, Christina Elsner, Irina Ritsch, Dr. Maren Pink, Dr. Suchada Rajca, Prof. Dr. Gunnar Jeschke, Prof. Dr. Andrzej Rajca, Prof. Dr. Enrica Bordignon   +9 more
doaj   +1 more source

In situ distance measurements in a membrane transporter using maleimide functionalized orthogonal spin labels and 5-pulse electron-electron double resonance spectroscopy

Journal of Magnetic Resonance Open, 2022
Spectroscopic investigation of membrane proteins in their native environment is a challenging task. Earlier we demonstrated the feasibility to measure precise distances within outer membrane proteins in E.
Sophie Ketter, Marina Dajka, Olga Rogozhnikova, Sergey A. Dobrynin, Victor M. Tormyshev, Elena G. Bagryanskaya, Benesh Joseph   +6 more
doaj   +1 more source

Electrolyte–Framework Matching in High‐Voltage TEMPO‐COF Cathodes for Lithium Batteries

Advanced Science, EarlyView.
TEMPO‐functionalized covalent organic frameworks are investigated as high‐voltage cathodes for lithium batteries. Screening five electrolyte anions identifies lithium difluoro(oxalato)borate (LiDFOB) as the optimal electrolyte, balancing capacity, rate capability, and cycling stability, while buckypaper electrodes achieve high mass loading (40 mg cm−2)
Marilyn Esclance DMello, Nagaraj Patil, Fanni Fekecs, Sergio Pinilla, Rebeca Marcilla, Manuel Souto   +5 more
wiley   +1 more source

Molecular Engineering of Polytriphenylamine: A Fluorinated Cathode for High‐Voltage, Ultrafast, and Stable Sodium‐Ion Batteries

Advanced Energy Materials, EarlyView.
Fluorination of polytriphenylamine lowers the HOMO energy, enabling high‐voltage operation of the PFTPA cathode. Electron‐withdrawing F substituents stabilize the nitrogen redox center and suppress polarization, leading to fast kinetics. The optimized polymer delivers ∼3.75 V vs.
Natalia Voronina, Irina A. Chuyko, Michael D. Khitrov, Koji Yazawa, Hitoshi Yashiro, Yuriy N. Luponosov, Seung‐Taek Myung   +6 more
wiley   +1 more source

Preparation of novel acyl pyrazoles and triazoles by means of oxidative functionalization reactions

Heterocyclic Communications, 2023
Novel acyl pyrazoles and acyl triazoles have been prepared by means of the oxidative amidation of aldehydes in the presence of the requisite azole. Yields range from modest to good in both cases, and some limitations of the substrate scope have been ...
Wadey Geoffrey P., Doherty Katrina E., Sandoval Arturo León, Leadbeater Nicholas E.   +3 more
doaj   +1 more source

Structural Features Governing the Metabolic Stability of Tetraethyl-Substituted Nitroxides in Rat Liver Microsomes

Antioxidants, 2023
Nitroxides are potent tools for studying biological systems by electron paramagnetic resonance (EPR). Whatever the application, a certain stability is necessary for successful detection.
Aleksandra Rančić, Nikola Babić, Maylis Orio, Fabienne Peyrot   +3 more
doaj   +1 more source

The crystal structure of 4′-{4-[(2,2,5,5-tetramethyl-N-oxyl-3-pyrrolin-3-yl)ethynyl]phenyl}-2,2′:6′,2′′-terpyridine

Acta Crystallographica Section E: Crystallographic Communications, 2015
The terpyridine group of the title compound, C31H27N4O, assumes an all-transoid conformation and is essentially planar with the dihedral angles between the mean planes of the central pyridine and the two outer rings amounting to 3.87 (5) and 1.98 (5 ...
Andreas Meyer, Jennifer Wiecek, Gregor Schnakenburg, Olav Schiemann   +3 more
doaj   +1 more source

Conformational tuning improves the stability of spirocyclic nitroxides with long paramagnetic relaxation times

Communications Chemistry, 2023
Nitroxides are widely used as probes and polarization transfer agents in spectroscopy and imaging. These applications require high stability towards reducing biological environments, as well as beneficial relaxation properties.
Mateusz P. Sowiński, Sahil Gahlawat, Bjarte A. Lund, Anna-Luisa Warnke, Kathrin H. Hopmann, Janet E. Lovett, Marius M. Haugland   +6 more
doaj   +1 more source