環境調和材料としての光機能性シリカゲルビーズ

概要

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Photofunctional silica gel beads have been developed as environmental conscious materials. The hydroxybenzophenone (Hbp) chromophore–bonded silica gel (SiO2) beads (1) were developed as UV–absorbents. 4,5–Dimethoxy–2–nitrobenzyloxycarbonyl (Nbz) chromophore–bonded SiO2 (2) was prepared in order to control the amounts and sites of functional group by a use of Nbz as a photolabile protecting group. Diacetoxyantimony tetraphenylporphyrinato chromophore (Sb(OAc)2tpp)–bonded SiO2 (3a) was packed in micro–channel reactor. The photoreaction of 3a with Et2NH induced the demetallation to give free base tetraphenylporphyrin chromophore (H2tpp)–bonded SiO2 (3b). The color change of the H2tpp–H–adsorbed SiO2 (4) under dry and humidity conditions was applied to a new type of humidity indicator without CoCl2. The Sb(OH)2tpp–H–adsorbed SiO2 (5) was used as visible light driven photocatalysts in dechlorination of 4–chlororophenol, epoxidation of cyclohexene, and bactericidal reaction of E. coli. Also dimethoxophosphorus tetraphenylporphyrine (P(OMe)2tpp–H)–adsorbed SiO2 (6b) was practically used to sterilization Legionella species naturally occurring in fountain.