Journal
DALTON TRANSACTIONS
Volume -, Issue 44, Pages 6311-6318Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b809494b
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Funding
- Swiss National Science Foundation
- Fondation Ernst et Lucie Schmidheiny
- Societe Academique de Geneve
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The synthesis and photophysical properties of a series of chromophore-quencher complexes are reported. They are all comprised of a luminescent rhenium(I) tricarbonyl diimine complex that is covalently attached to anthracene or phenanthrene moieties via rigid rod-like p-xylene bridges of variable lengths. Rhenium-to-anthracene energy transfer is strongly exergonic (-Delta G0 approximate to 0.9 eV) and causes very efficient rhenium MLCT luminescence quenching. By contrast, rhenium-to-phenanthrene energy transfer is only observed when complexes with sufficiently high MLCT energies are used because for these dyads, the driving force for energy transfer is low (-Delta G(0) approximate to 0.1 eV). For a similar to 15 angstrom donor-acceptor distance, the rate constants of the weakly and the strongly exergonic energy transfer processes differ by more than 3 orders of magnitude.
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