2-(Thienyl)quinoxaline derivatives and their application in Ir( iii ) complexes yielding tuneable deep red emitters †

Fitzgerald, Sophie A., Payce, Ellie N., Horton, Peter N., Coles, Simon J. and Pope, Simon J. A. ORCID: https://orcid.org/0000-0001-9110-9711 2023. 2-(Thienyl)quinoxaline derivatives and their application in Ir( iii ) complexes yielding tuneable deep red emitters †. Dalton Transactions 52 (44) , p. 16480. 10.1039/d3dt02193a

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Abstract

The synthesis and characterisation of eleven different 2-(thienyl)quinoxaline species that incorporate different points of functionality, including at the thiophene or quinoxaline rings, are described. These species display variable fluorescence properties in the visible region (λem = 401–491 nm) depending upon the molecular structures and extent of conjugation. The series of 2-(thienyl)quinoxaline species were then investigated as cyclometalating agents for Ir(iii) to yield [Ir(C^N)2(bipy)]PF6 (where C^N = the cyclometalated ligand; bipy = 2,2′-bipyridine). Eight complexes were successfully isolated and fully characterised by an array of spectroscopic and analytical techniques. Two Ir(iii) examples were structurally characterised in the solid state using single crystal X-ray diffraction; both structures confirmed the proposed formulations and coordination spheres in each case showing that the thiophene coordinates via a Ir–C bond. The photophysical properties of the complexes revealed that each complex is luminescent under ambient conditions with a range of emission wavelengths observed (665–751 nm) indicating that electronic tuning can be achieved via both the thienyl and quinoxaline moieties.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/3.0/, Start Date: 2023-10-24
Publisher:	Royal Society of Chemistry
ISSN:	1477-9226
Date of First Compliant Deposit:	25 October 2023
Date of Acceptance:	19 October 2023
Last Modified:	28 Nov 2023 14:14
URI:	https://orca.cardiff.ac.uk/id/eprint/163492

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