The anodic oxidation of 1,4-diaminobenzene: an electron spin resonance and electrochemical study

Substituent effects on the electrochemical and spectral characteristics of N,N,N′,N′-tetraaryl-p-phenylenediamine derivatives

“…The second oxidation product for CPD2 is also unstable. The dication may undergo follow-up chemical reactions in the media as shown in the previous study on the anodic oxidation of 1,4-diaminobenzene in methanol/water mixture [20]. However, the second oxidation products for MPD2 and APD2 reflected good stability.…”

The Electrochemical Analog of the Methylene Blue Reaction: A Novel Amperometric Approach to the Detection of Hydrogen Sulfide

“…Further analysis of the cyclic voltammogram of the DMPD system (Figures 1 and 3) shows that the reduction peak current is smaller than that of the oxidation peak current, suggesting that some of the DMPD species have undergone a chemical reaction. This reaction is believed to be hydrolysis by the solvent molecules as shown in Scheme 3 [18,24].…”

EPR Spectroscopy in Electrochemistry

“…Compton and coworkers [13] observed a similar comproportionation reaction for the case of para-phenylenediamine. [115] studied the reduction of 1,2-dicyanobenzene in acetonitrile at mercury electrodes.…”

“…Like the laterdeveloped channel flow cell, this setup (shown in Fig. 23) permits the interrogation of electrode reaction mechanisms of relatively long-lived radical species, [9][10][11][12][13][14] since the convective-diffusion equations are mathematically well defined, which at steady state are given by Eq. (37) where ν 0 is the velocity of flow at the center of the tube, r 0 is the radius of the tube, r is the radial distance from the center of the tube, x is the distance down the tube, D is the diffusion coefficient of the species generated on the electrode, and c is its concentration.…”

“…It will be appreciated that the former technique is more advantageous than the latter, in that it may be used in the study of radicals with a shorter lifetime range. Whist the ex situ technique has many merits, notably in Albery's use of a tube electrode with a mathematically well-defined flow of electrolytes in the study of the kinetics and mechanisms of a variety of electrode processes [9][10][11][12][13][14], this overview will be exclusively concerned with the more sensitive in situ approach to electrochemical EPR; the interested reader is referred to two earlier reviews by Waller and Compton [15,16] that describe the historical development of electrochemical EPR.…”