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Issue 44, 2008
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Energy transfer from rhenium(i) complexes to covalently attached anthracenes and phenanthrenes

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Abstract

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 (−ΔG0≈ 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 (−ΔG0≈ 0.1 eV). For a ∼15 Å donor–acceptor distance, the rate constants of the weakly and the strongly exergonic energy transfer processes differ by more than 3 orders of magnitude.

Graphical abstract: Energy transfer from rhenium(i) complexes to covalently attached anthracenes and phenanthrenes

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Article information


Submitted
04 Jun 2008
Accepted
05 Aug 2008
First published
07 Oct 2008

Dalton Trans., 2008, 6311-6318
Article type
Paper

Energy transfer from rhenium(I) complexes to covalently attached anthracenes and phenanthrenes

M. E. Walther and O. S. Wenger, Dalton Trans., 2008, 6311
DOI: 10.1039/B809494B

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