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Lookup NU author(s): Emeritus Professor Anthony Harriman,
Dr Guillaume Izzet
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A small series of ruthenium(II) tris(2,2′-bipyridine) complexes has been synthesized in which ethynylated thiophene residues are attached to one of the 2,2′-bipyridine ligands. The photophysical properties depend on the conjugation length of the thiophene-based ligand, and in each case, dual emission is observed. The two emitting states reside in thermal equilibrium at ambient temperature and can be resolved by emission spectral curve-fitting routines. This allows the properties of the two states to be evaluated in both fluid butyronitrile solution and a transparent KBr disk. It is concluded that both emitting states are of metal-to-ligand charge-transfer (MLCT) character, and despite the presence of conjugated thiophene residues, there is no indication for a low-lying π,π*-triplet state that promotes nonradiative decay of the excited-state manifold. A key feature of these systems is that the conjugation length imposed by the thiophene-based ligand helps to control the rate constants for both radiative and nonradiative decay from the two MLCT triplet states. © 2006 American Chemical Society.
Author(s): Harriman A, Izzet G, Goeb S, De Nicola A, Ziessel R
Publication type: Article
Publication status: Published
Journal: Inorganic Chemistry
ISSN (print): 0020-1669
ISSN (electronic): 1520-510X
Publisher: American Chemical Society
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