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Fig. 8. Structure of faujasite showing central supercage surrounded by sodalite cages, along with cation sites. http://turmac13.chem.columbia.edu/images/publications/NJT728.gif Reproduced with permission of Prof. N. Turro. degradation of malodorous sulfur-containing molecules14. 2-(6- hydroxy-3-oxo-(3H)-xanthen-9-yl)benzoic acid (fluorescein) has been prepared inside the pores of zeolite-Y, even though the fluorescein molecules are too large to pass through the 8 A ̊ windows of the faujasite zeolite used (Figure 8). This was accom- plished by the acid-catalysed reaction of resorcinol and phthalic anhydride contained within the zeolite micropores. Spectroscopic data are presented along with one example that these fluorescence-labelled nano-particles might serve for imaging applications such as confocal fluorescence microscopy15. Similarly, a [2]-catenane consisting of a bipyridinium cyclophane and a dioxybenzene macrocyclic polyether has been encapsulated within the supercages of zeolite Y. Laser flash photolysis reveals that the charge-separated species decays over a period of hundreds of microseconds in contrast to the few picoseconds previously reported for the same transient in acetonitrile solution. It is deduced that photochemical quenching is largely precluded in the zeolite matrix16. Many and various different catalytic centres can be encapsulated into zeolite micropores, frequently using ship-in-a- bottle methods, to create materials that are especially effective for use in oxidation reactions. Sometimes the resulting materials are termed zeozymes, ‘‘zeolite mimics of enzymes’’ in analogy with enzymes, though none of these synthetic counterparts based on www.scienceprogress.co.uk Properties and applications of zeolites 233 Black plate (233,1)PDF Image | Properties and applications of zeolites
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