Electrochromic devices based on wide band-gap nanocrystalline semiconductors functionalized with mononuclear charge transfer compounds

A series of ruthenium and iron mononuclear complexes were prepared and their spectroeletrochemical behavior characterized on Optically Transparent Thin Layer Electrodes (OTTLE) and on Fluorine Doped SnO2 (FTO) conductive glasses coated with Sb-doped nanocrystalline SnO2. These systems display a reversible electrochemical response and offer potential application in electrochromic devices. On SnO2 films distinct spectral changes are observed in a narrow potential range (−0.5/0.9 V vs SCE) with switching times of the order of 0.8 s.