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Injecting Electronic Excitation Energy into an Artificial Antenna System through an Ru 2+ Complex
Author(s) -
Bossart Olivia,
De Cola Luisa,
Welter Steve,
Calzaferri Gion
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400743
Subject(s) - luminescence , acceptor , excitation , molecule , zeolite , excited state , singlet state , fluorescence , photochemistry , steric effects , chemistry , materials science , atomic physics , optoelectronics , stereochemistry , physics , optics , condensed matter physics , organic chemistry , quantum mechanics , catalysis
The Ru 2+ complex [Ru(bpy) 2 (bpy‐ph 4 ‐Si(CH 3 ) 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 Ru 2+ 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 Ru 2+ 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.