Development of anthocyanin-based photochromic material having low environmental impact and high safety

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A composite of a synthetic anthocyanin-based dye (2-Hydroxy-4'-methoxychalcone) and mesoporous silica, which shows photochromic properties even in dry conditions (not as a solution), was prepared. For obtaining a composite material that displays a color upon ultraviolet irradiation and becomes colorless when stored in the dark, mesoporous silica that contains a small amount of Al was most suitable. On the other hand, mesoporous silica with alkyl trimethyl ammonium ions in the mesopores was most effective for a composite that showed coloration-decoloration cycles induced by alternating irradiation with ultraviolet light of different wavelengths.