Experimental and theoretical studies of pH-responsive iridium(<scp>iii</scp>) complexes of azole and N-heterocyclic carbene ligands

Hashemzadeh, Tahmineh; Christofferson, Andrew J.; White, Keith F.; Barnard, Peter J.

doi:10.1039/d3dt03766e

Dalton Trans.

2024

DOI: 10.1039/d3dt03766e

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Experimental and theoretical studies of pH-responsive iridium(iii) complexes of azole and N-heterocyclic carbene ligands

Tahmineh Hashemzadeh,

Andrew J. Christofferson,

Keith F. White

et al.

Abstract: A series of nine luminescent iridium(iii) complexes with pH-responsive imidazole and benzimidazole ligands have been prepared and characterized.

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Iridium(III) Complexes of Bifunctional 2-(2-Pyridyl)imidazole Ligands: Electrochemiluminescent Emitters in Aqueous Media

Ramkissoon,

Armendariz-Vidales,

D’Alton

et al. 2024

Inorg. Chem.

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A series of electrochemiluminescent (ECL) iridium(III) complexes with the general formula [Ir(C ∧ N) 2 (pim)] + (where C ∧ N = cyclometalating ligands 2-phenylpyridinato (ppy) or 2-(2,4-difluorophenyl)pyridinato (dFppy), and pim = 2-(2pyridyl)imidazole) have been synthesized. In each case, the 2-(2-pyridyl)imidazole ancillary ligand has been modified to facilitate bioconjugation and ECL label development. All complexes exhibit blue-shifted optical and electro-generated phosphorescence relative to the archetypal complex [Ir(ppy) 2 (bpy)] + (bpy = 2,2′-bipyridine).The emission energies for the complexes were unperturbed by functionalization of the imidazole unit of the pim ligand, whereas the emission energy was significantly blue-shifted when the pyridyl group was modified with an electron-donating oxyethanol unit. Cyclic voltammetric studies provide results consistent with fluorine substituents on the cyclometalating ligands, or an oxyethanol substituent on the neutral pim ligand, widening the highest occupied molecular orbital (HOMO)−lowest unoccupied molecular orbital (LUMO) gap of these complexes. Most of the complexes have high photoluminescence quantum yields (Φ PL ) in acetonitrile (up to 0.91), and some have higher ECL efficiencies than [Ru(bpy) 3 ] 2+ in both acetonitrile (up to 177%) and ProCell buffer (up to 202%). Theoretical studies provide additional insights into the photophysical and electrochemical properties of this series of compounds.

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Iridium(III) Complexes of Bifunctional 2-(2-Pyridyl)imidazole Ligands: Electrochemiluminescent Emitters in Aqueous Media

Ramkissoon,

Armendariz-Vidales,

D’Alton

et al. 2024

Inorg. Chem.

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Experimental and theoretical studies of pH-responsive iridium(iii) complexes of azole and N-heterocyclic carbene ligands

Abstract: A series of nine luminescent iridium(iii) complexes with pH-responsive imidazole and benzimidazole ligands have been prepared and characterized.

Cited by 1 publication

References 79 publications

Iridium(III) Complexes of Bifunctional 2-(2-Pyridyl)imidazole Ligands: Electrochemiluminescent Emitters in Aqueous Media

Iridium(III) Complexes of Bifunctional 2-(2-Pyridyl)imidazole Ligands: Electrochemiluminescent Emitters in Aqueous Media

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