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

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2015-11, Vol.757, p.230-234
• Main Authors: Moura, Silio Lima, Santos Júnior, José Ribeiro dos, Machado, Francisco Bolivar Correto, Kawachi, Elizabete Yoshie, Ferrão, Luiz Fernando de Araujo
• Format: Article
• Language: English
• Subjects: Conductive polymer; Electropolymerization; Fe3 +/Fe2 + redox couple; Polyaniline; Polydapsone
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2015.09.037

The 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. [Display omitted] •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.