The electrochemical oxidation of dibenzo(c,e)-1,2-diselenine to its cation radical. A voltammetric study in acetonitrile at conventional electrodes and microelectrodes

1996 ◽  
Vol 401 (1-2) ◽  
pp. 183-189 ◽  
Author(s):  
R. Müller ◽  
L. Lamberts ◽  
M. Evers
Keyword(s):  
Electrochemical Oxidation ◽  
Cation Radical ◽  
Voltammetric Study

Chemical and electrochemical oxidation of phenothiazine

1993 ◽  
Vol 71 (5) ◽  
pp. 674-677 ◽  
Author(s):  
Alexei N. Pankratov ◽  
Inna M. Uchaeva ◽  
Alexander N. Stepanov
Keyword(s):  
Electrochemical Oxidation ◽  
Sulphuric Acid ◽  
Quantum Chemical ◽  
Oxidation Reaction ◽  
Cation Radical ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Diffusion Controlled ◽  
Voltammetric Technique

The oxidation of phenothiazine in dilute solutions of sulphuric acid leads to the corresponding cation radical. Using a potentiometric technique, a pKa value of 5.72 ± 0.05 was determined for phenothiazine. The kinetics has been studied and participation of both protonated and unprotonated oxidant in the oxidation reaction has been confirmed. Using a voltammetric technique with a rotating disk electrode, the anodic oxidation of phenothiazine was shown to be a one-electron diffusion-controlled process. A quantum chemical explanation was found for the direction of phenothiazine protonation and the absence of a dimerization stage of oxidation.

The Electrochemical Oxidation of 6-Aminoquinoline: Computational and Voltammetric Study

2012 ◽  
Vol 159 (11) ◽  
pp. G151-G159 ◽  
Author(s):  
Milica C. Stević ◽  
Gordana Ćirić-Marjanović ◽  
Budimir Marjanović ◽  
Ljubiša M. Ignjatović ◽  
Dragan Manojlović
Keyword(s):  
Electrochemical Oxidation ◽  
Voltammetric Study

Coulometry in resonator cavity of EPR spectrometer: Electrochemical oxidation of carbazole methyl derivatives

1981 ◽  
Vol 46 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Pavel Kubáček
Keyword(s):  
Electrochemical Reduction ◽  
Electrochemical Oxidation ◽  
Electrode Surface ◽  
Cation Radical ◽  
Radical Product ◽  
Spin Concentration ◽  
Resonator Cavity ◽  
Methyl Derivatives ◽  
Simultaneous Measuring ◽  
Radical Character

Electrochemical reduction of carbazole, 3-methyl- and 3,9-dimethylcarbazole in acetonitrile leads to the formation of a layer of conductive, insoluble products on the electrode surface of a partially radical character. This phenomenon was studied by coulometry in the resonator cavity of an EPR spectrometer with simultaneous measuring of the spin concentration. With carbazole and 3-methylcarbazole, the radical particles are formed with a yield of about 2% with respect to the current passed, whereas with 3,9-dimethylcarbazole this yield is by an order or magnitude lower. The radical product adsorbed on the electrode is probably a sparingly soluble perchlorate of the cation radical of 3,3'- or 6,6'-bicarbazole. 3,6,9-Trimethylcarbazole gives on oxidation a relatively stable primary cation radical. Electrochemical oxidation of 9-methyl- and 3,6-dimethylcarbazole does not lead to radical products.

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