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Blue electrogenerated chemiluminescence from water-soluble iridium complexes containing sulfonated phenylpyridine or tetraethylene glycol derivatized triazolylpyridine ligands

Citation

Kerr, E and Doeven, EH and Barbante, GJ and Connell, TU and Donnelly, PS and Wilson, DJD and Ashton, TD and Pfeffer, FM and Francis, PS, Blue electrogenerated chemiluminescence from water-soluble iridium complexes containing sulfonated phenylpyridine or tetraethylene glycol derivatized triazolylpyridine ligands, Chemistry: A European Journal, 21, (42) pp. 14987-14995. ISSN 0947-6539 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

DOI: doi:10.1002/chem.201502037

Abstract

Incorporating phenylpyridine- and triazolylpyridine-based ligands decorated with methylsulfonate or tetraethylene glycol (TEG) groups, a series of iridium(III) complexes has been created for green and blue electrogenerated chemiluminescence under analytically useful aqueous conditions, with tri-n-propylamine as a coreactant. The relative electrochemiluminescence (ECL) intensities of the complexes were dependent on the sensitivity of the photodetector over the wavelength range and the pulse time of the applied electrochemical potential. In terms of the integrated area of corrected ECL spectra, with a pulse time of 0.5 s, the intensities of the IrIII complexes were between 18 and 102 % that of [Ru(bpy)3]2+ (bpy=2,2′-bipyridine). However, when the intensities were measured with a typical bialkali photomultiplier tube, the signal of the most effective blue emitter, [Ir(df-ppy)2(pt-TEG)]+ (df-ppy=2-(2,4-difluorophenyl)pyridine anion, pt-TEG=1-(2-(2-(2-(2-hydroxyethoxy)ethoxy)ethoxy)ethyl)-4-(2-pyridyl)-1,2,3-triazole), was over 1200 % that of the orange–red emitter [Ru(bpy)3]2+. A combined experimental and theoretical investigation of the electrochemical and spectroscopic properties of the IrIII complexes indicated that the greater intensity from [Ir(df-ppy)2(pt-TEG)]+ relative to those of the other IrIII complexes resulted from a combination of many factors, rather than being significantly favored in one area.

Item Details

Item Type:Refereed Article
Keywords:ECL, iridium complexes
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Sensor Technology (Chemical aspects)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Barbante, GJ (Dr Gregory Barbante)
ID Code:103713
Year Published:2015
Web of Science® Times Cited:12
Deposited By:Chemistry
Deposited On:2015-10-26
Last Modified:2015-11-16
Downloads:0

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