• Mechanism of 1-phenylazo-2-naphthol-3,6-disulphonic acid reduction on a mercury electrode

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    • Keywords


      1-Phenylazo-2-naphthol-3,6-disulphonic acid (disodium salt); polarography; cyclic voltammetry; azo dyes

    • Abstract


      The reduction of 1-phenylazo-2-naphthol-3,6-disulphonic acid (disodium salt) at the dropping mercury electrode has been investigated. The reduction takes place in a two-electron step. The process is diffusion controlled. The reagent captures two electrons and one or two hydrogen ions depending on whether the pH is higher or lower than 7, producing 1-phenylhydrazo-2-naphthol-3,6-disulphonic acid, in both cases. A disproportionation reaction of the hydrazo compound takes place, and amines are the final reduction products. The reaction orders, together with Tafel’s slopes have been calculated.

    • Author Affiliations


      F Capitan1 A Guiraum1 J L Vilchez1 J M Bosque1

      1. Department of Analytical Chemistry, Analytical Section of CSIC, Faculty of Sciences, University of Granada, Granada, Spain
    • Dates

  • Journal of Chemical Sciences | News

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