Injecting electronic excitation energy into an artificial antenna system through an Ru2+ complex |
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Authors: | Bossart Olivia De Cola Luisa Welter Steve Calzaferri Gion |
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Affiliation: | Department of Chemistry and Biochemistry, University of Berne, 3012 Berne, Switzerland. |
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Abstract: | The Ru2+ complex [Ru(bpy)2(bpy-ph4-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 1 (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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Keywords: | dyes/pigments energy transfer luminescence ruthenium supramolecular chemistry zeolites |
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