Formation and Decay of Fluorobenzene Radical Anions Affected by Their Isomeric Structures and the Number of Fluorine Atoms

2010 ◽  
Vol 114 (31) ◽  
pp. 8069-8074 ◽  
Author(s):  
Saki Higashino ◽  
Akinori Saeki ◽  
Kazumasa Okamoto ◽  
Seiichi Tagawa ◽  
Takahiro Kozawa
Keyword(s):  
Radical Anions ◽  
Isomeric Structures

Photolytic and thermal annealing of radical anions gamma-irradiated monocarboxylic acids

1979 ◽  
Vol 44 (12) ◽  
pp. 3632-3643 ◽  
Author(s):  
Karel Mach ◽  
Igor Janovský ◽  
Karel Vacek
Keyword(s):  
Thermal Annealing ◽  
Pivalic Acid ◽  
Esr Spectra ◽  
Paramagnetic Species ◽  
Radical Anions ◽  
Γ Irradiation ◽  
Before And After ◽  
Optical Bleaching ◽  
The Difference ◽  
Gamma Irradiated

Total yields of paramagnetic species, their optical bleaching and thermal annealing in acetic, propionic, a-butyric, isobutyric, and pivalic acid γ-irradiated at 77 K were followed by ESR spectroscopy. Radical anions, always found after irradiation, disappear during optical bleaching without formation of any paramagnetic product. During thermal annealing they are converted almost quantitatively into the α-radicals of the respective acid, with the exception of pivalic acid. Amounts of radical anions were estimated from the difference of integrated ESR spectra taken before and after optical bleaching. The results show that approximately equal amounts of the reduction and oxidation paramagnetic products of the γ-irradiation can be detected.

Stability of radical anions derived from substituted 5-nitrofurans investigated by ESR spectroscopy

1985 ◽  
Vol 50 (7) ◽  
pp. 1594-1601 ◽  
Author(s):  
Jiří Klíma ◽  
Larisa Baumane ◽  
Janis Stradinš ◽  
Jiří Volke ◽  
Romualds Gavars
Keyword(s):  
Radical Anion ◽  
High Stability ◽  
Esr Spectroscopy ◽  
Reaction Path ◽  
Order Reaction ◽  
Second Order ◽  
Radical Anions ◽  
Second Order Reaction ◽  
Unpaired Electron Density ◽  
The Stability

It has been found that the decay in dimethylformamide and dimethylformamide-water mixtures of radical anions in five of the investigated 5-nitrofurans is governed by a second-order reaction. Only the decay of the radical anion generated from 5-nitro-2-furfural III may be described by an equation including parallel first- and second-order reactions; this behaviour is evidently caused by the relatively high stability of the corresponding dianion, this being an intermediate in the reaction path. The presence of a larger conjugated system in the substituent in position 2 results in a decrease of the unpaired electron density in the nitro group and, consequently, an increase in the stability of the corresponding radical anions.

Magnetostructural relationships in [Ni(dmit)2] − radical anions

2021 ◽  
Author(s):  
Jhon Enrique Zapata Rivera ◽  
Carmen J. Calzado
Keyword(s):  
Magnetic Properties ◽  
Radical Anions ◽  
The Relationship

This work explores the relationship between the magnetic properties of salts based on the [Ni(dmit)2]− radicals and the different arrangement that these radicals can adopt in the crystals, induced by...

scholarly journals Photoelectron spectroscopy of anthracene and fluoranthene radical anions

2018 ◽  
Vol 148 (23) ◽  
pp. 234306 ◽  
Author(s):  
Steven J. Kregel ◽  
Glen K. Thurston ◽  
Etienne Garand
Keyword(s):  
Photoelectron Spectroscopy ◽  
Radical Anions

Paramagnetic Molecular Semiconductors Combining Anisotropic Magnetic Ions with TCNQ Radical Anions

2021 ◽  
Author(s):  
Ökten Üngör ◽  
Maylu Burrows ◽  
Tianhan Liu ◽  
Michael Bodensteiner ◽  
Yuwaraj Adhikari ◽  
...  
Keyword(s):  
Radical Anions ◽  
Magnetic Ions ◽  
Molecular Semiconductors

scholarly journals Excitation of Radical Anions of Naphthalene Diimides in Consecutive‐ and Electro‐Photocatalysis

ChemCatChem ◽  
2021 ◽  
Author(s):  
Sofia Caby ◽  
Lydia M. Bouchet ◽  
Juan E. Argüello ◽  
Roberto A. Rossi ◽  
Javier I. Bardagi
Keyword(s):  
Radical Anions ◽  
Naphthalene Diimides

Electron affinities of benzaldehydes. Substituent effects on stabilities of aromatic radical anions

1993 ◽  
Vol 34 (26) ◽  
pp. 4223-4226 ◽  
Author(s):  
Masaaki Mishima ◽  
Chul Huh ◽  
Hirotaka Nakamura ◽  
Mizue Fujio ◽  
Yuho Tsuno
Keyword(s):  
Substituent Effects ◽  
Radical Anions ◽  
Electron Affinities ◽  
Aromatic Radical

Cyclisierung von Di(tert-butyl-methyl)ketazin zu 1,2-Diaza-3-bora- und 1,2-Diaza-3-sila-cyclopent-5-enen / Cyclization of Di(tert-butyl-methyl)ketazine to 1,2-Diaza-3-bora- and 1,2-Diaza-3-sila-cyclopent-5-enes

2006 ◽  
Vol 61 (10) ◽  
pp. 1261-1274 ◽  
Author(s):  
Florian Armbruster ◽  
Nina Armbruster ◽  
Uwe Klingebiel ◽  
Mathias Noltemeyer ◽  
Stefan Schmatz
Keyword(s):  
Crystal Structures ◽  
Quantum Chemical Calculations ◽  
Chlorine Atom ◽  
Quantum Chemical ◽  
Membered Ring ◽  
Substitution Product ◽  
Tert Butyl ◽  
Isomeric Structures

The results of quantum chemical calculations on lithium ketazides suggest mainly four isomeric structures with different modes of lithium coordination (A-D). A monolithium ketazide thf-adduct (1) was isolated supporting the results of the quantum chemical calculations. In reactions of the lithiated di(tert-butyl-methyl)ketazine with BCl3 and Cl2BPh, 1,2-aza-azonia-3-borata-cyclopent-5-enes (2, 3) were isolated. Substitution of a chlorine atom of 2 and 3 with t-BuLi leads to the formation of derivatives 4 and 5. HCl elimination from 2 with Et3N gives - via a diazaboracyclopentene (6) - a bicyclus 7. In the reaction of the dilithiated ketazine with F2BN(SiMe3)2, the diaza-boracyclopentene 8 is obtained while with Cl4Si, F3SiN(SiMe3)2, and Cl2SiMe2 the diazasilacyclopentenes 9 - 11 are generated. SiF4 reacts with the dilithium ketazide to give a spirocyclus (12). The monolithium ketazide and Cl2SiMe2 react at 30 °C to give a four-membered ring isomer of the substitution product which is formed via a 1,3-chlorine shift from silicon to carbon (13). A tetrameric silanolate was isolated as a by-product in this reaction. It gives evidence for the structure of lithium ketazide A. Crystal structures of 5, 7, 10, and 14 are reported.

Carbene radical anions. New species of reactive intermediate

1972 ◽  
Vol 94 (20) ◽  
pp. 7174-7176 ◽  
Author(s):  
G. Dann Sargent ◽  
Charles M. Tatum ◽  
Scott M. Kastner
Keyword(s):  
New Species ◽  
Radical Anions ◽  
Reactive Intermediate
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