The effect of the electronic structure of the donor on the kinetics of the one-electron reduction of phenoxyl radicals

1976 ◽  
Vol 11 (2) ◽  
pp. 196-198
Author(s):  
V. D. Pokhodenko ◽  
V. A. Khizhnyi ◽  
V. A. Samarskii
Keyword(s):  
Electronic Structure ◽  
Phenoxyl Radicals ◽  
Electron Reduction ◽  
The One ◽  
Kinetics Of

ChemInform Abstract: The One-Electron Reduction Potential of 4-Substituted Phenoxyl Radicals in Water.

ChemInform ◽  
1990 ◽  
Vol 21 (17) ◽  
Author(s):  
J. LIND ◽  
X. SHEN ◽  
T. E. ERIKSEN ◽  
G. MERENYI
Keyword(s):  
Reduction Potential ◽  
Phenoxyl Radicals ◽  
Electron Reduction ◽  
The One

The one-electron reduction potential of 4-substituted phenoxyl radicals in water

1990 ◽  
Vol 112 (2) ◽  
pp. 479-482 ◽  
Author(s):  
J. Lind ◽  
X. Shen ◽  
T. E. Eriksen ◽  
Gabor Merenyi
Keyword(s):  
Reduction Potential ◽  
Phenoxyl Radicals ◽  
Electron Reduction ◽  
The One

Structural consequences of the one-electron reduction of d4[Mo(CO)2(η-PhCCPh)Tp′]+and the electronic structure of the d5radicals [M(CO)L(η-MeCCMe)Tp′] {L = CO and P(OCH2)3CEt}

2006 ◽  
pp. 3466-3477 ◽  
Author(s):  
Christopher J. Adams ◽  
Ian M. Bartlett ◽  
Supakorn Boonyuen ◽  
Neil G. Connelly ◽  
David J. Harding ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electron Reduction ◽  
The One

Arrangement Of Monomeric Units In Fibrin

1979 ◽  
Author(s):  
Jan Hermans
Keyword(s):  
Fiber Axis ◽  
High Symmetry ◽  
Linear Polymers ◽  
Fiber Volume ◽  
High Fiber ◽  
Rotation Axes ◽  
Small Set ◽  
Helical Turn ◽  
The One ◽  
Kinetics Of

Measurements of light scattering have given much information about formation and properties of fibrin. These studies have determined mass-length ratio of linear polymers (protofibrils) and of fibers, kinetics of polymerization and of lateral association and volume-mass ratio of thick fibers. This ratio is 5 to 1. On the one hand, this high value suggests that the fiber contains channels that allow the diffusion of enzymes such as Factor XHIa and plasmin; on the other hand, the high value appears paradoxical for a stiff fiber made up of elongated units (fibrin monomers) arranged in parallel. Such a high fiber volume is a property of only a small set out of many high-symmetry models of fibrin, which may be constructed from overlapping three-domain monomers which are arranged into strands, are aligned nearly parallel to the fiber axis and make adequate longitudinal and lateral contacts. These models contain helical protofibrils related to each other by rotation axes parallel to the fiber axis. The protofibrils may contain 2, 3 or 4 monomers per helical turn and there are four possible symmetries. A large specific volume is achieved if the ends of each monomer are slightly displaced from the protofibril axis, either by a shift or by a tilt of the monomer. The fiber containing tilted monomers is more highly interconnected; the two ends of a tilted monomer form lateral contacts with different adjacent protofibrils, whereas the two ends of a non-tilted monomer contact the same adjacent protofibril(s).

scholarly journals Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1686
Author(s):  
Andrey Galukhin ◽  
Roman Nosov ◽  
Ilya Nikolaev ◽  
Elena Melnikova ◽  
Daut Islamov ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Single Step ◽  
Polymerization Kinetics ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Diffusion Controlled ◽  
Polymerization Product ◽  
The One ◽  
Kinetics Of

A new rigid tricyanate ester consisting of seven conjugated aromatic units is synthesized, and its structure is confirmed by X-ray analysis. This ester undergoes thermally stimulated polymerization in a liquid state. Conventional and temperature-modulated differential scanning calorimetry techniques are employed to study the polymerization kinetics. A transition of polymerization from a kinetic- to a diffusion-controlled regime is detected. Kinetic analysis is performed by combining isoconversional and model-based computations. It demonstrates that polymerization in the kinetically controlled regime of the present monomer can be described as a quasi-single-step, auto-catalytic, process. The diffusion contribution is parameterized by the Fournier model. Kinetic analysis is complemented by characterization of thermal properties of the corresponding polymerization product by means of thermogravimetric and thermomechanical analyses. Overall, the obtained experimental results are consistent with our hypothesis about the relation between the rigidity and functionality of the cyanate ester monomer, on the one hand, and its reactivity and glass transition temperature of the corresponding polymer, on the other hand.

scholarly journals Redox and Antioxidant Modulation of Circadian Rhythms: Effects of Nitroxyl, N-Acetylcysteine and Glutathione

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2514
Author(s):  
Santiago Andrés Plano ◽  
Fernando Martín Baidanoff ◽  
Laura Lucía Trebucq ◽  
Sebastián Ángel Suarez ◽  
Fabio Doctorovich ◽  
...  
Keyword(s):  
Soluble Guanylate Cyclase ◽  
Phase Locking ◽  
Cyclic Guanosine Monophosphate ◽  
Guanosine Monophosphate ◽  
Circadian Phase ◽  
Subjective Night ◽  
Circadian Time ◽  
Electron Reduction ◽  
Locomotor Rhythms ◽  
The One

The circadian clock at the hypothalamic suprachiasmatic nucleus (SCN) entrains output rhythms to 24-h light cycles. To entrain by phase-advances, light signaling at the end of subjective night (circadian time 18, CT18) requires free radical nitric oxide (NO•) binding to soluble guanylate cyclase (sGC) heme group, activating the cyclic guanosine monophosphate (cGMP)-dependent protein kinase (PKG). Phase-delays at CT14 seem to be independent of NO•, whose redox-related species were yet to be investigated. Here, the one-electron reduction of NO• nitroxyl was pharmacologically delivered by Angeli’s salt (AS) donor to assess its modulation on phase-resetting of locomotor rhythms in hamsters. Intracerebroventricular AS generated nitroxyl at the SCN, promoting phase-delays at CT14, but potentiated light-induced phase-advances at CT18. Glutathione/glutathione disulfide (GSH/GSSG) couple measured in SCN homogenates showed higher values at CT14 (i.e., more reduced) than at CT18 (oxidized). In addition, administration of antioxidants N-acetylcysteine (NAC) and GSH induced delays per se at CT14 but did not affect light-induced advances at CT18. Thus, the relative of NO• nitroxyl generates phase-delays in a reductive SCN environment, while an oxidative favors photic-advances. These data suggest that circadian phase-locking mechanisms should include redox SCN environment, generating relatives of NO•, as well as coupling with the molecular oscillator.

The One-Electron Reduction Potential of 3-Amino-1, 2, 4-benzotriazine 1, 4-dioxide (Tirapazamine): A Hypoxia-Selective Bioreductive Drug

1996 ◽  
Vol 25 (5) ◽  
pp. 393-399 ◽  
Author(s):  
K. Indira Priyadarsini ◽  
Michael Tracy ◽  
Peter Wardman
Keyword(s):  
Reduction Potential ◽  
Electron Reduction ◽  
The One

scholarly journals Synthesis and electronic structure determination of uranium(vi) ligand radical complexes

2016 ◽  
Vol 45 (31) ◽  
pp. 12576-12586 ◽  
Author(s):  
Khrystyna Herasymchuk ◽  
Linus Chiang ◽  
Cassandra E. Hayes ◽  
Matthew L. Brown ◽  
Jeffrey S. Ovens ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Structure Determination ◽  
Salen Ligands ◽  
The One

Pentagonal bipyramidal uranyl (UO22+) complexes of salen ligands were prepared and the electronic structure of the one-electron oxidized species[1a–c]+were investigated in solution.

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