The electrocatalytic influence of underpotential Pb, Tl and Bi adsorbates on the electrochemical behaviour of 2,4-DINITROSORESORCINOL (cas 118-02-5) and tetraoxime of 1-cyclohexene-3,4,5,6-tetrone on Pt and Au

Add time:08/28/2019    Source:sciencedirect.com

The electrochemical behaviour of 2,4-DINITROSORESORCINOL (cas 118-02-5) (DNR) on Pt and Au electrodes modified by underpotentially-deposited heavy metal monolayers was studied in aqueous HClO4 solutions. At these modified electrodes, DNR is reduced to 2,4-diaminoresorcinol. The reduction wave of this eight-electron reaction is diffusion-controlled. This process proceeds through hydroxylamine intermediates whilst an azoxy derivative is formed by a condensation reaction between DNR and the dihydroxylamino intermediate. The reduction and oxidation of tetraoxime of 1-cyclohexene-3,4,5,6-tetrone (TCT) was also studied on Pt surfaces covered by heavy metal monolayers. The reduction of TCT is a 12-electron reaction yielding phenylene-1,2,3,4-tetramine. The reduction of this cathodic process also exhibits diffusion-controlled character. The oxidation of TCT is a four-electron reaction producing 1,2,3,4-tetranitrosobenzene which is rapidly converted to the tautomeric form benzobifuroxan.

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