Electrochemistry of perylene imide and anhydride derivatives adsorbed on
semiconductor TiO2 (NT) and insulator Al2O3 (NA) metal oxide
films were presented. Adsorption rates on metal oxide surface are observed
to be strongly depending on molecular structure. Monoanhydride-monoimide
derivatives show two reversible reductions in solution and one reversible
reduction in films. Color change from red to blue and violet is observed
indicating the formation of monoanion and dianion radicals.
Spectroelectrochemical measurements support this interpretation. The color
reversal is quite stable in NA films in comparison with NT films.