A novel sulfur–nitrogen π-heterocyclic radical anion, (6H-1,2,3-benzodithiazol-6-ylidene)malononitrilidyl, and its homo- and heterospin salts

Polyhedron ◽  
2014 ◽  
Vol 72 ◽  
pp. 43-49 ◽  
Author(s):  
Alexander Yu. Makarov ◽  
Elena A. Chulanova ◽  
Nikolay A. Semenov ◽  
Nikolay A. Pushkarevsky ◽  
Anton V. Lonchakov ◽  
...  
Keyword(s):  
Radical Anion ◽  
Heterocyclic Radical

Synthesis and Electrochemical Reduction of Methyl 3-Halo-1-benzothiophene-2-carboxylates

2004 ◽  
Vol 69 (1) ◽  
pp. 242-260 ◽  
Author(s):  
Michal Rejňák ◽  
Jiří Klíma ◽  
Jiří Svoboda ◽  
Jiří Ludvík
Keyword(s):  
Cyclic Voltammetry ◽  
Radical Anion ◽  
Preparative Method ◽  
Platinum Electrodes ◽  
Disk Electrode ◽  
Dimer Formation ◽  
Halide Anion ◽  
Primary Radical ◽  
Heterocyclic Radical ◽  
Ece Mechanism

A preparative method of synthesis of the new methyl 3-iodo-1-benzothiophene-2-carboxylate was elaborated. Electrochemical behavior of methyl 3-chloro-, bromo- and iodo-1-benzothiophene-2-carboxylates 1-3, and of their reduction and dimer products 4, 5 in anhydrous dimethylformamide has been investigated at mercury and platinum electrodes using polarography, cyclic voltammetry and voltammetry on a rotating platinum disk electrode. The reduction in divided cells follows the ECE mechanism (electron - chemical step - electron), where the primary radical anion is split into a halide anion and neutral heterocyclic radical, which is immediately reduced by the second electron and protonated. The only reduction product is the methyl 1-benzothiophene-2-carboxylate (5); whereas the EDim mechanism (electron - dimer formation) leading to the dimeric species 4 was not observed under the above conditions. Reduction of 1-3 on platinum causes formation of a blocking film on the electrode. Sonication during electrolysis successfully reactivates the electrode.

Heterospin π-Heterocyclic Radical-Anion Salt: Synthesis, Structure, and Magnetic Properties of Decamethylchromocenium [1,2,5]Thiadiazolo[3,4-c][1,2,5]thiadiazolidyl

2010 ◽  
Vol 49 (16) ◽  
pp. 7558-7564 ◽  
Author(s):  
Nikolay A. Semenov ◽  
Nikolay A. Pushkarevsky ◽  
Anton V. Lonchakov ◽  
Artem S. Bogomyakov ◽  
Elena A. Pritchina ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Radical Anion ◽  
Heterocyclic Radical

Novel long-lived π-heterocyclic radical anion: a hybrid of 1,2,5-thiadiazo- and 1,2,3-dithiazolidyls

2015 ◽  
Vol 25 (5) ◽  
pp. 336-338 ◽  
Author(s):  
Elena A. Chulanova ◽  
Irina G. Irtegova ◽  
Nadezhda V. Vasilieva ◽  
Irina Yu. Bagryanskaya ◽  
Nina P. Gritsan ◽  
...  
Keyword(s):  
Radical Anion ◽  
Heterocyclic Radical

Association of radical anion with alkali cations. IV. ESR study of the 4-nitrobenzophenone radical anion

1980 ◽  
Vol 45 (2) ◽  
pp. 369-375 ◽  
Author(s):  
Stanislav Miertuš ◽  
Ondrej Kyseľ
Keyword(s):  
Hyperfine Splitting ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Supporting Electrolyte ◽  
Esr Spectra ◽  
Proton Donor ◽  
Alkali Cations

The 4-nitrobenzophenone radical anion prepared by electrolysis was studied by ESR spectroscopy. On the basis of the interpretation of ESR spectra, the conformation of this system was estimated. The effect of the concentration of supporting electrolyte and of the presence of a proton-donor agent (C2H5OH) was examined. It is assumed that changes in hyperfine splitting constants are caused by association.

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.

Radical Chain Reduction via Carbon Dioxide Radical Anion (CO2•–)

2021 ◽  
Author(s):  
Cecilia M. Hendy ◽  
Gavin C. Smith ◽  
Zihao Xu ◽  
Tianquan Lian ◽  
Nathan T. Jui
Keyword(s):  
Carbon Dioxide ◽  
Radical Anion ◽  
Radical Chain

Radical Anion of Benz[a]pyrene

1970 ◽  
Vol 53 (12) ◽  
pp. 4725-4726 ◽  
Author(s):  
Jack Robinson
Keyword(s):  
Radical Anion
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