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Photophysical properties of ruthenium(II) tris(2,2′-bipyridine) complexes bearing conjugated thiophene appendages

Lookup NU author(s): Emeritus Professor Anthony Harriman, Dr Guillaume Izzet

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Abstract

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.

Publication metadata

Author(s): Harriman A, Izzet G, Goeb S, De Nicola A, Ziessel R

Publication type: Article

Publication status: Published

Journal: Inorganic Chemistry

Year: 2006

Volume: 45

Issue: 24

Pages: 9729-9741

ISSN (print): 0020-1669

ISSN (electronic): 1520-510X

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/ic060921w

DOI: 10.1021/ic060921w

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