ELECTROCHEMICAL FORMATION OF TWO-COMPONENT ELECTROACTIVE FILMS OF PALLADIUM AND FULLERENE COVALENTLY ATTACHED TO A ZINC PORPHYRIN REDOX PROBE

摘要

Redox active films have been generated electrochemically by the reduction of a dyad consisting of fullerene C_(60) covalently linked to zinc meso-tetraphenyloporphyrin, ZnP-C_(60), and palladium acetate. The films are believed to consist of a polymeric network formed via covalent bonds between the palladium atoms and the fullerene moieties. In these films, the zinc porphyrin moiety is covalently linked to the polymeric chains through the pyrrolidine ring of the fullerene. The ZnP-C_(60)/Pt films are electrochemically active in both positive and negative potential excursions. At positive potentials, two oxidation steps for the zinc porphyrin are observed. In the negative potential range, electron transfer processes involving the fullerene moieties occur. Film formation is also accompanied by palladium deposition on the electrode surface. The presence of a metallic phase in the film influences its morphology, structure and electrochemical properties.