1. 1. Breck, D. W. Zeolite Molecular Sieves (Wiley, New York, 1974). 2. Weitkamp, J., Karge, H. G., Pfiefer, H. & Holderich, W. (eds) Zeolites and Related Materials: State of the Art (Elsevier, Amsterdam, 1994). 3. Kalyanasundaram, K. Photochemistry in Microheterogeneous Systems (Academic, New York, 1987). 4. O'Regan, B. & Gratzel, M. Nature 353, 737-740 (1991). 5. Krueger, J. A., Meyer, J. E. & Mallouk, T. E. /. Am. Chem. Soc. 110, 8232-8234 (1988). 6. De Vos, D. E. et al. J. Indus. Phenom. Mol. Recogn. Chem. 21, 185-213 (1995). 7. Sykora, M., Maruszewski, K., Treffert-Ziemelis, S. M. & Kincaid, J. R. /. Am. Chem. Soc. (submitted). 8. DeWilde, W., Peters, G. & Lunsford, L. H. /. Phys. Chem. 84, 2306-2310 (1980). 9. Quayle, W. H. & Lunsford, J. H. Inorg. Chem. 21, 97-103 (1982). 10. Dutta, P. K. & Turbeville, W. /. Phys. Chem. 96, 9410-9416 (1992). 11. Borja, M. & Dutta, P. K. Nature 362, 43-45 (1993). 12. Wiliner, J., Yang, J., Loane, C, Otvos, J. W. & Calvin, M. /. Phys. Chem. 85, 3277-3282 (1981). 13. Slama-Schwork, A., Ottolenghi, M. & Avnir, D. Nature 355, 240-242 (1992). 14. Maruszewski, K., Strommen, D. P., Handrich, K. & Kincaid, J. R. Inorg. Chem. 30,4579-4582 (1991). 15. Maruszewski, K., Strommen, D. P., Handrich, K. & Kincaid, J. R. /. Am. Chem. Soc. 115, 8345-8350 (1993). 16. Maruszewski, K. & Kincaid, J. R. Inorg. Chem. 34, 2002-2006 (1995). 17. Toma, H. E., Auburn, P. R., Dodsworth, E. S., Golovin, M. N. & Lever, A. B. P. Inorg. Chem. 26, 4257-4263(1987).