Electrogeneration and characterization of a poly(pyrrole-nickel (II) chlorin) electrode

We describe herein, the electrochemical properties of an hydroporphyrin of Ni(II) substituted by two pyrrole groups in organic media (THE and CH2Cl2). In the anodic region it has been shown that the electrochemical behaviour of this complex investigated by cyclic voltammetry and coulometry coupled with UV-visible spectroscopy is strongly dependent on the nature of the solvent. Furthermore, the electrochemical oxidation of the pyrrrole groups has led to the first example of an electrogenerated polypyrrole-metallochlorin film. The resulting modified electrodes exhibit the same electrochemical properties as the monomer free in solution. Preliminary experiments have also demonstrated the possibility to study electrochemically this polymeric film in CH3CN contrary to the Ni(II) chlorin, which is insoluble in this medium. (C) 2002 Elsevier Science B.V. All rights reserved.