Results 11 to 20 of about 1,375 (174)

Coupling Aqueous Phase Chemical Actinometry with EPR Spectroscopy: An Approach for Probing Photochemical Processes at the Air-Sea Interface. [PDF]

Chemphyschem
Photochemical investigations were coupled with radical detection for quantifying oxidative processes in sea‐surface microlayer (SML) samples. A chemical actinometry approach was employed to measure photon flux in in situ EPR experiments and under solar irradiation.
Scheres Firak D, Schaefer T, Yang B, Jibaja Valderrama O, van Pinxteren M, Herrmann H.   +5 more
europepmc   +2 more sources

Photocatalytic Oxidation of Alcohols with Organic Dyes: From Homogeneous Systems to Sensitized Materials. [PDF]

Chemistry
We discuss the developments in the light‐driven oxidation of alcohols with PC. We report cases where the homogeneous systems can be interfaced with electrochemical tools or adapted in flow and where the PC are integrated in sensitized materials. Abstract The oxidation of alcohols retains an enormous importance in industry and in synthetic organic ...
Tacchi E, Rossi G, Sartorel A.
europepmc   +2 more sources

Mediated Electrochemical Oxidation of Nucleosides to Their 5'-Carboxylic Acid Derivatives. [PDF]

Chemistry
Sweet oxidation method: A mediated electrochemical oxidation method has been developed that enables selective oxidation of the nucleosides and ribosugars to afford the 5′‐carboxylic acid derivatives. The method tolerates each of the nucleobases and various protecting group variations.
Abrams DJ, Johnson MR, Lacker CR, Yoon TP, Martinelli JR, Stahl SS.   +5 more
europepmc   +2 more sources

Deconstructive Radical-Radical Coupling for Programmable Remote Acylation. [PDF]

Angew Chem Int Ed Engl
A unified approach to access a variety of 1,n‐dicarbonyls through a radical‐promoted deconstructive process utilizing dual photocatalysis/carbene catalysis is reported. The utility of this strategy is demonstrated with a broad scope with robust functional group tolerance along with application in the preparation of γ‐amino esters, three‐component ...
Cao J, Schull CR, Scheidt KA.
europepmc   +3 more sources

Waste‐free oxidation of alcohols at the surface of catalytic electrodes: What is required for industrial uptake?

Electrochemical Science Advances, 2022
The electrocatalytic oxidation of alcohols at the surface of stable catalytic electrodes functionalized with aminoxyl radicals results in a waste‐free process affording highly valued carbonyl or carboxylic compounds using an electric current only ...
Rosaria Ciriminna, Mina Ghahremani, Babak Karimi, Mario Pagliaro   +3 more
doaj   +1 more source

Cyclic [Cu-biRadical]₂ Secondary Building Unit in 2p-3d and 2p-3d-4f Complexes: Crystal Structure and Magnetic Properties

Molecules, 2023
Employing the new nitronyl nitroxide biradical ligand biNIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-bis(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide)), a 16-spin Cu-radical complex, [Cu8(biNIT-3Py-5-Ph)4(hfac)16] 1, and three 2p-3d-4f chain complexes, {[Ln ...
Xiao-Tong Wang, Xiao-Hui Huang, Hong-Wei Song, Yue Ma, Li-Cun Li, Jean-Pascal Sutter   +5 more
doaj   +1 more source

A Hidden Coordination-Bond Torsional Deformation as a Sign of Possible Spin Transition in Nickel(II)-Bis(nitroxide) Compounds

Molecules, 2020
Complex formation of nickel(II) tetrafluoroborate and tert-butyl 5-phenyl-2-pyridyl nitroxide (phpyNO) in the presence of sodium cyanate gave a discrete molecule [Ni(phpyNO)2(X)2] (X = NCO). The Ni-O-N-Csp2 torsion angles were reduced on heating; 33.5(5)°
Yukiya Kyoden, Takayuki Ishida
doaj   +1 more source

Lipophilic tetramethylpiperidine N-oxyl (TEMPO) as a phase-transfer redox mediator in thin films for anion and cation sensing

Electrochemistry Communications, 2023
This study successfully demonstrates the use of a lipophilic derivative of TEMPO, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl stearate, as a redox mediator for ion transfer processes at the interface between two immiscible electrolyte solutions. The results
Gabriel J. Mattos, Nikolai Yu. Tiuftiakov, Eric Bakker   +2 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

Aminoxyl Radicals of B/P Frustrated Lewis Pairs: Refinement of the Spin-Hamiltonian Parameters by Field- and Temperature-Dependent Pulsed EPR Spectroscopy. [PDF]

PLoS ONE, 2016
Q-band and X-band pulsed electron paramagnetic resonance spectroscopic methods (EPR) in the solid state were employed to refine the parameters characterizing the anisotropic interactions present in six nitroxide radicals prepared by N,N addition of NO to
Marcos de Oliveira, Robert Knitsch, Muhammad Sajid, Annika Stute, Lisa-Maria Elmer, Gerald Kehr, Gerhard Erker, Claudio J Magon, Gunnar Jeschke, Hellmut Eckert   +9 more
doaj   +1 more source