Voltammetric oxidation of acetophenone derivatives and benzophenone in acetonitrile on a platinum and glassy carbon electrode

Abstract

Full paper/M emoire Voltammetric oxidation of acetophenone derivatives and benzophenone in acetonitrile on a platinum and glassy carbon electrode L aszl o Kiss a, b, * , S andor Kuns agi-M at e a, b, c

Electrochemical oxidation of benzaldehyde and hydroxybenzaldehydes in acetonitrile on platinum and glassy carbon electrodes

“…This compound might be adsorbed on the glassy carbon surface and further oxidized on the aromatic ring, resulting in the formation of polymers. The benzoyl moiety can also react as it was demonstrated in an earlier work in the case of benzophenone: an anodic peak appeared in the first scan with the glassy carbon electrode [8]. It evidences unambiguously that in the previous studies with 3,4dihydroxybenzaldehyde, oxidation of the formyl group took place where the second peak appeared and where the second smaller peak showed up by the monohydroxy derivatives.…”

“…As can be seen, the electrode was passivated quickly by derivatives containing only one hydroxy group. In an earlier work where para-substituted acetophenones and among them, 4 0 -hydroxyacetophenone was investigated in acetonitrile at higher anodic potentials, passivation took place continuously by repeating the scans [8]. In that work, it was demonstrated that the solvent itself contributed to the process.…”

Effect of Anodic Pretreatment on the Performance of Glassy Carbon Electrode in Acetonitrile and Electrooxidation of Para-substituted Phenols in Acetonitrile on Platinum and Glassy Carbon Electrode

“…The potential window was between 0 and 2 V for p-methoxyphenol as its oxidation peak appeared at less positive potential than 2 V. It shows that the methoxy group significantly activates the benzene ring. Its voltammograms were reproducible, however the height of the first one is a little smaller than that of the other ones indicating that the surface of platinum was cleaned electrochemically in the first scan which was also observed by other electroactive materials in acetonitrile on platinum electrode [17]. As a matter of fact p-methoxyphenol is the monomethyl ether of 1,4-dihydroxybenzene which can be oxidized similarly to 1,4-dihydroxybenzene producing a protonated species similar to p-benzoquinone in aprotic nonaqueous solvents.…”

“…In an earlier work where substituted acetophenones were examined in acetonitrile between 0 and 4 V it was found that the oxidation peaks of acetophenones appeared only in the first scan due to the solvent [17]. By increasing the electrode potential to extreme values might result in undesired reactions which take place at the electrode/solution interface being due to the diminished solvent and/or electrode stability.…”

Estudo eletroquímico de compostos nitro-heterocíclicos potencialmente antichagásicos utilizando eletrodos quimicamente modificados com ftalocianinas

“…Merece realçar que uma ampla diversidade de eletrodos de trabalho tem sido aplicada nas pesquisas sobre o comportamento eletroquímico de nitro-heterocíclicos, a se destacar eletrodos sólidos como ouro, platina ou carbono. O emprego destes eletrodos é justificado pelos intervalos de potenciais úteis de trabalho que apresentam em diversos solventes (CHIAVASSA, CAMILO, LA-SCALEA, 2021;JASHARI et al, 2021;ABBAR, METI, NADIBEWOOR, 2020;KISS, KUNSÁGI-MÁTÉ, 2019;STOILJKOVIC et al, 2012).…”