ANODIC VOLTAMMETRY AND ESR STUDIES OF P-PHENYLENEDIAMINE AND SOME OF ITS DERIVATIVES IN ACETONITRILE

Abstract

The electrochemical oxidation of p-phenylenediamine and its derivatives was studied on platinum electrode in acetonitrile. The oxidation mechanism was composed of two successive one-electron reversible waves. The hyperfine ESR spectra of the cation radicals were observed by electrolysis on the first wave. The generation of the same cation radicals could be performed by electrolysis on the second wave, indicating the presence of an electron exchange reaction between the dication and the parent molecule in solution.

Reaction with N,N‐Diethyl‐p‐phenylenediamine: A Procedure for the Sensitive Square‐Wave Voltammetric Detection of Chlorine

“…The corresponding voltammetric responses for a solution containing 200 mM TMPD are detailed in Figure 4c, this reveals two reduction waves at 0.44 V and 0.32 V consistent with that observed in the literature [26]. Upon addition of chlorine to the solution no appreciable change was observed in the voltammetric signal, suggesting that no reaction has occurred and so providing further evidence for the proposed reaction mechanism.…”

Synthesis of poly(o -phenylenediamine) nanofiber with novel structure and properties

“…In organic solvent medium, first radical was formed in both the ―NH 2 groups because of addition of APS as an oxidative radical initiator. Then, it was oxidized to cyclohexa‐3, 5‐diene‐1, 2‐diylidenediamine just like oxidation of p‐phenylenediamine to diamine especially in non‐aqueous medium, and the polymerization was occurred through this derivative of o‐phenylenediamine. Both the NH groups of cyclohexa‐3, 5‐diene‐1, 2‐diylidenediamine were protonated by only one molecule of sulfuric acid formed by reduction of APS, just like oPD polymerization in sulfuric acid medium .…”

Oxidative transformation processes and products of para-phenylenediamine (PPD) and para-toluenediamine (PTD)—a review

“…The UV absorbance of the aqueous solution was measured during the various stages of the redox cycle additionally (Table 5). Various other electrochemical investigations, performed in organic solvents and buffer mixtures, partially accompanied by EPR-and UV/VIS absorbance measurements, indicated the formation of a SBQDIR cation too but did not provide a higher reliability of their findings [36][37][38][39][40]. Melchior and Maki compared the EPR data of the SBQDIRC synthesized from 1 H-PPD and from ring deuterated PPD (d 4 -PPD), resulting in a structure confirmation due to almost identical hyperfine structure data [39].…”