The electropolymerization of 7,14-diphenylacenaphtho[1,2-k]fluoranthene on a platinum or indium tin oxide (ITO) electrode produces an electroactive film which displays fluorescence and electrochromism. We report a study of the electrochemical properties and other characteristics of this film, such as the resistance dependence by the potential applied to the electrode. In particular, the film showed dramatic changes in the resistance and color as a function of the potential applied to the film because of changes in the electronic state of the polymer. Atomic force microscopy, scanning electrochemical microscopy, and electrochemical quartz crystal microbalance studies were also carried out to characterize the polymer film.