Injecting electronic excitation energy into an artificial antenna system through an Ru2+ complex.
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.
Bossart
Olivia
O
Department of Chemistry and Biochemistry, University of Berne, 3012 Berne, Switzerland.
De Cola
Luisa
L
Welter
Steve
S
Calzaferri
Gion
G
D002413:Cations, Divalent / Q000737:chemistry; D004583:Electrons; D008856:Microscopy, Fluorescence; D015394:Molecular Structure; D012428:Ruthenium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
D002413:Cations, Divalent; D012428:Ruthenium