Elgar, Christopher, Otaif, Haleema, Beames, Joseph  ORCID: https://orcid.org/0000-0002-5508-8236, Horton, Peter, Coles, Simon, Hallett, Andrew, O'Kell, Sean and Pope, Simon J. ORCID: https://orcid.org/0000-0001-9110-9711
2023.
Deep red emitting heteroleptic Ir(III) complexes that incorporate unsymmetrical 4-quinoline carboxylic acid derived ligands.
European Journal of Inorganic Chemistry
26
(18)
, e202300102.
10.1002/ejic.202300102
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Abstract
Six disubstituted ligands based upon 2-(2¢-pyridinyl/pyrazinyl)quinoline-4-carboxylic acids have been synthesised, solvent-free, in one step from a range of commercially available isatin derivatives. These species behave as ancilllary chelating ligands for Ir(III) complexes of the form [Ir(C^N)2(N^N)]PF6 (where C^N = cyclometalating ligand; N^N = 2-(2¢-pyridinyl/pyrazinyl)quinoline-4-carboxylic acids). An X-ray crystallographic study on one complex shows a distorted octahedral geometry wherein a cis-C,C and trans-N,N coordination mode is observed. DFT calculations predicted that changing the N^N ligand from 2,2¢-bipyridine to L1-6 should localise the LUMO on to the Ln ligand and that the complexes are predicted to display MLCT/LLCT character. All complexes displayed luminescence in the deep red part of the visible region (674-679 nm) and emit from triplet states, but with little apparent tuning as a function of L1-6. Further time-resolved transient absorption spectroscopy supports the participation of these triplet states to the excited state character.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Professional Services > Advanced Research Computing @ Cardiff (ARCCA) Schools > Chemistry |
| Publisher: | Wiley-VCH Verlag |
| ISSN: | 1434-1948 |
| Date of First Compliant Deposit: | 20 April 2023 |
| Date of Acceptance: | 30 March 2023 |
| Last Modified: | 11 Jun 2024 14:53 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/158925 |
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