Conductive organic polymers: An electrochemical route for the polymerization of dapsone

• Polydapsone was electrochemically synthesized for the first time.
• The polymer redox activity exhibits excellent stability in acid solution.
• The polymer mediated the electron transfer between Fe3 +/Fe2 + ions and GCE.
• The polymer has admittance similar to pure and sulfonated polyanilines.
• The polymerization occurs via amino–amino coupling.

ABSTRACTThe electropolymerization of dapsone by anodic oxidation is reported for the first time. The conditions in which a non-conducting oligomeric film or a conductive polymeric film of dapsone is formed are also discussed, based on the scan rate and potential window applied. The cyclic voltammetry of dapsone-polymer presented redox activities that have not been shown before, to the authors' knowledge, demonstrating its high electronic conductivity. The electrochemical impedance response of the dapsone-polymer indicates that their admittance is similar to pure and sulfonated polyanilines, while for the dapsone-oligomers is characteristic of insulating materials. Infrared spectroscopy of both oligomers and polymer supports that the polymerization occurs via amino–amino coupling, since no modifications in the aromatic ring is observed.

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