chronocoulometric studies at the surface of phthalocyaninethin film electrodes

thin film phthalocyanines(pc), incloding zinc, iron, and magnesium phthalocyani-nes, were prepared by vacuum deposition method. chronocoulometry was used to study the charge transfer reaction mechanism of ionic species through the thin films. the results obtained in chronocoulometric studies shows that the thin film phthalocyanines could operate via two mechanisms.the first mechanism metal pc thin film behaves as a semiconductor electrode and charge transfer occurs at the surface of phthalocyanine electrode.the second mechanism reflects the passing of electrolyte ionic species (nitrate, perchlorate, and chloride anions) through the pc thin film (membrane). the thickness of the prepared pc film is a limiting and determining factor, so that for a thickness of <100ǻ passing of anions through the membrane, and for a thickness of >100ǻ semiconductorial effects were observed. the thickness of thin film metal phthalocyanines were 100 – 3000ǻ.