Deep red emitting heteroleptic Ir(III) complexes that incorporate unsymmetrical 4-quinoline carboxylic acid derived ligands

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:	Advanced Research Computing @ Cardiff (ARCCA) 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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