ELECTROPOLYMERIZATION OF 2-HYDROXY-3-AMINOPHENAZINE (HAPH) - PROPERTIES OF PHAPH FILMS AND KINETICS OF OXIDATION AND INCORPORATION OF DIHYDROXYBENZENES AT PT PHAPH ELECTRODES/

2-Hydroxy-3-aminophenazine (HAPh) gives stable redox active polymer (p HAPh) films after oxidative electropolymerization on Pt, Au, glassy ca rbon and ITO electrodes. pHAPh is a new ladder polymer with structures and redox properties closely related to those of poly(o-phenylenediam ine) and poly(o-aminophenol). The electropolymerization of HAPh on Au is accompanied by electrodissolution of the Au substrate. Dissolved Au species are redeposited producing dispersed gold crystallites in the organic polymer film. The pHAPh film can respond to dissolved organic species, such as dihydroxybenzenes and p-benzoquinone, in the electroi nactive potential range. For the oxidation of dihydroxybenzenes the ra te controlling processes are all three contributary steps, i.e. charge transport and diffusion of substrate within the film and cross-exchan ge electron transfer reaction between the substrate and the redox site s of the film. For p-benzoquinone, the reduction process is solely gov erned by substrate diffusion within the film. RRDE measurements have s hown that the dihydroxybenzenes are incorporated in the pHAPh film in the reduced state. There is also evidence that p-benzoquinone is also incorporated in the film when it is in the oxidized state.