Abstract
The characterization and properties of a newly developed electrochromic organic thin film prepared by a vacuum evaporation technique are described. The mechanism of the redox reaction of 2,4,7-trinitro-9-fluorenylidene malononitrile (TNF-MN) in the thin film state was investigated by using polarized FT-IR spectroscopy. In both the oxidized and the reduced states, the vacuum-evaporated TNF-MN molecules were found to exist in a planar structure, oriented parallel to the electrode. Moreover, the electrochemical reaction of the TNF-MN film was found to depend on the size of the counter-cation injected for charge compensation.
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