Samples of zeolite Y containing 2,4,6-triphenylpyrylium or tris(bipyridyl)ruthenium(II) have been prepared and their photophysical and photochemical properties compared to those of the same samples containing encapsulated nanoscopic TiO 2 clusters as relays. The emission of encapsulated Ru(bpy) 3 2+ and TP + photolumophores undergoes static quenching in the presence of codoped TiO 2 clusters. This is the expected behavior for systems, where photosensitizer and relay lack diffusional mobility. Time-resolved diffuse reflectance laser flash photolysis shows the transient generation of TP • pyranyl radical and Ru(bpy) 3 3+, upon irradiation of TP + and Ru(bpy) 3 2+ in the presence of TiO 2, respectively. This provides firm support for the occurrence of photoinduced electron transfer between excited TP + as acceptor and TiO 2 clusters as donors and from Ru(bpy) 3 2+ to the conduction band of TiO 2 . Using the photoinactivation of horseradish peroxidase as a test reaction in aqueous medium, a synergism has been found with respect to the activity of Ru(bpy) 3 2+ or TP + photocatalysts when incorporated inside the supercages of zeolite Y in the presence of TiO 2 nanoclusters.
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Cosa et al. (2002) studied this question.
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