Electrochromic Properties of bis(phthalocyaninato)lutetium(III) Sensitized Nanostructured Anatase TiO[sub 2] Thin Films

Nanoporous anatase thin films have been sensitized with bis(phthalocyaninato)lutetium(III) complexes and their electrochromic properties were investigated at room temperature in neutral and acidic aqueous media. Cyclic voltammetry. and spectroelectrochemistry measurements show that the typical neutral green color state of is reduced to a brown color state at potentials below vs. at neutral when is adsorbed onto a nanostructured surface. Disproportionation of the complex while scanning in aqueous medium is assumed to be responsible for this behavior.