ELECTROANALYSIS AND ELECTROCATALYSIS USING POLY(VINYLFERROCENIUM) PERCHLORATE COATED ELECTRODES

Electroanalytical applications based on the electrochemical behavior o f the redox polymer, poly(vinylferrocenium) perchlorate (PVF+ClO4-) co ated as a film on Pt surfaces, are described. This chemically modified surface is electroactive due to the existence of ferrocenium/ferrocen e sites in its structure. Electrooxidation and electroreduction of oth er depolarizers can also take place through this polymeric film. Anion s such as iodide, thiocyanate and cyanide are incorporated in the poly meric structure as a result of anion exchange. Anodic stripping of the anions from the film can be carried out after the initial preconcentr ation. Catalytic reduction and oxidation of anthracene occur on the PV F+ClO4- coated Pt surface in acetonitrile/TBAP medium. An enzyme such as glucose oxidase could be immobilized in the polymeric matrix and th is surface could be used for the amperometric determination of glucose under aerobic conditions. Coimmobilization of two enzymes, glucose ox idase and invertase, in the same polymeric matrix allows for the devel opment of an amperometric sucrose sensor.