Redox active two-component films of palladium and covalently linked zinc porphyrin-fullerene dyad

Redox active films have been generated electrochemically by the reduction of dyads 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 zinc porphyrin and the fullerene entities are observed. 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.