Chromism is the reversible colour change that a compound undergoes induced by external stimuli (pH, solvent, heat, light, mechanical stimuli, etc.) and is used for food additive detection, 1 light dimmers, 2 and biological probes. The design strategies of organic chromic molecules are usually based on changes in the π-conjugation or molecular aggregation of long linearly conjugated molecules. Polycyclic aromatic hydrocarbons (PAHs) have also attracted considerable attention as chromophores because of their expected absorption in the visible and near-infrared regions. Fluoranthenes, whose skeleton contains benzene and naphthalene units connected by a cyclopentane ring, represent a class of non-alternant PAHs.