期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 10, 期 22, 页码 5771-5775出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200400743
关键词
dyes/pigments; energy transfer; luminescence; ruthenium; supramolecular chemistry; zeolites
The Ru2+ complex [Ru(bPY)(2)(bpy-ph(4)-Si(CH3)(3))](2+) can be electrostatically bound to the negatively charged channel entrances of dye-loaded zeolite L crystals where it acts as a functional stopcock molecule. Impressive electronic triplet-singlet excitation energy transfer from the Ru2+ complex to the acceptor dye oxazine I (Ox1) located inside the channels can be observed when the donor molecule is selectively excited. Time-resolved luminescence experiments have been performed on the separate components and on the assembled donor-acceptor material. The luminescence lifetime of the Ru2+ complex attached to the zeolite is reduced by a factor of 30 when Ox1 acceptor molecules are present. The fluorescence decay of Ox1 incorporated in zeolite L is single exponential with a lifetime of 3 ns. The much longer lifetime in zeolite L than in solution is due to the fact, that the diethyl groups are sterically restricted when the dye is inside the host.
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