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Issue 18, 2015
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Cationic, luminescent cyclometalated iridium(iii) complexes based on substituted 2-phenylthiazole ligands

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Abstract

Ten cationic heteroleptic iridium(III) complexes, [Ir(emptz)2(N^N)](PF6) were prepared from a cyclometalated iridium bridged-chloride dimer involving two ethyl-4-methylphenylthiazole-5-carboxylate (emptz) ligands. One X-ray crystallographic study was undertaken where the ancillary N^N ligand was 4,7-diphenyl-1,10-phenanthroline and revealed the anticipated structure, showing a distorted octahedral coordination geometry at Ir(III). The complexes were visibly luminescent with modestly structured emission at 540–590 nm and lifetimes (60–340 ns) consistent with phosphorescence. TD-DFT calculations suggest that strong MLCT character contributes to the visible absorption characteristics, whilst the moderately structured emission profiles indicate a 3MLCT/3IL admixture of states to the phosphorescence.

Graphical abstract: Cationic, luminescent cyclometalated iridium(iii) complexes based on substituted 2-phenylthiazole ligands

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Publication details

The article was received on 03 Oct 2014, accepted on 03 Dec 2014 and first published on 11 Dec 2014


Article type: Paper
DOI: 10.1039/C4DT03054K
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Dalton Trans., 2015,44, 8488-8496

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    Cationic, luminescent cyclometalated iridium(III) complexes based on substituted 2-phenylthiazole ligands

    E. C. Stokes, E. E. Langdon-Jones, L. M. Groves, J. A. Platts, P. N. Horton, I. A. Fallis, S. J. Coles and S. J. A. Pope, Dalton Trans., 2015, 44, 8488
    DOI: 10.1039/C4DT03054K

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