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Tuning the electrochemiluminescent properties of iridium complexes of N-heterocyclic carbene ligands

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Abstract

A series of five heteroleptic Ir(III) complexes of the general form Ir(dfppy)2(C^C) have been prepared (where dfppy represents 2-(2,4-difluorophenyl)pyridine and C^C represents a bidentate cyclometalated phenyl substituted imidazolylidene ligand). The cyclometalated phenyl ring of the imidazolylidene ligand was either unsubstituted or substituted with electron donating (OMe and Me) or electron withdrawing (Cl and F) groups in the 2 and 4 positions. The synthesised Ir(III) complexes have been characterised by elemental analysis, NMR spectroscopy, cyclic voltammetry and electronic absorption and emission spectroscopy. The molecular structures for four Ir(III) complexes were determined by single crystal X-ray diffraction. Each of the Ir(III) complexes exhibited intense photoluminescence in acetonitrile solution at room temperature with quantum yields (ΦPL) ranging from 58% to 86%. Cyclic voltammetry experiments revealed one oxidation process (formally ascribed to the metal centre), and two ligand-based reductions for each complex. Complexes 1–5 gave moderate to intense annihilation and co-reactant electrochemiluminescence (ECL). Consideration of the electrochemical, spectroscopic and theoretical investigations provide insights into the electrochemiluminescence behaviour.

Graphical abstract: Tuning the electrochemiluminescent properties of iridium complexes of N-heterocyclic carbene ligands

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Publication details

The article was received on 08 Nov 2018, accepted on 04 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04433C
Citation: Dalton Trans., 2018, Advance Article
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    Tuning the electrochemiluminescent properties of iridium complexes of N-heterocyclic carbene ligands

    L. M. Quan, B. D. Stringer, M. A. Haghighatbin, J. Agugiaro, G. J. Barbante, D. J. D. Wilson, C. F. Hogan and P. J. Barnard, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT04433C

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