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Transport of electronic excitation energy in dye-loaded zeolite L

Transport of electronic excitation energy in dye-loaded zeolite L. Minkowski, Claudia; Calzaferri, Gion (Department of Chemistry and Biochemistry, University of Bern, Bern CH-3012, Switz.). Chimia, 59(3), 88-93 (English) 2005 Swiss Chemical Society. CODEN: CHIMAD. ISSN: 0009-4293. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 65 Zeolite L is an aluminosilicate with one-dimensional channels, having an opening diam. of 7.1 ?. This allows the incorporation of different, electronically non-interacting dye mols. to build an artificial photonic antenna system. The conditions within the channels are such that the dye mols. cannot glide past each other. There are some commonly used reagents like 3073-87-8 in this article. Hence, a consecutive incorporation leads to crystals with different compartments, where the d. of one kind of dye is dominant. The photophys. processes taking place on such dye-loaded zeolite L antenna systems can be studied either on single micrometer or submicrometer sized crystals, on crystals dispersed in a solvent, or coated as thin layers on a support. The energy transfer process that occurs is of the Foerster-type and its transfer rate can be tuned, e.g. by first incorporating the acceptor dyes, in a second step consecutively incorporating different amts. of spacer mols. and then in a third step adding the donor dyes. By selectively exciting the donor, energy transfer to the unexcited acceptor as a function of the amt. of spacer mols. can be obsd. To make a quant. anal., one has to take into consideration the situation at the phase boundaries of the particular compartments. This has been done by modeling the distribution of the dye mols. and empty sites within a zeolite crystal by means of a Monte Carlo simulation. .