Pyrazolo[4,3-h]quinoline Ligand-Based Iridium(III) Complexes for Electrochemiluminescence

Chien-Wei Hsu; Elena Longhi; Stephan Sinn; Chris S Hawes; David C Young; Paul E Kruger; Luisa De Cola

doi:10.1002/asia.201700556

Pyrazolo[4,3-h]quinoline Ligand-Based Iridium(III) Complexes for Electrochemiluminescence

Chem Asian J. 2017 Jul 4;12(13):1649-1658. doi: 10.1002/asia.201700556. Epub 2017 Jun 6.

Authors

Chien-Wei Hsu^{1

2}, Elena Longhi¹, Stephan Sinn^{1

2}, Chris S Hawes³, David C Young³, Paul E Kruger³, Luisa De Cola^{1

2}

Affiliations

¹ Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université Strasbourg, 8 allée Gaspard Monge, 67083, Strasbourg, France.
² Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
³ Department of Chemistry, MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Canterbury, Private Bag 4800, Christchurch, 8041, New Zealand.

PMID: 28503856
DOI: 10.1002/asia.201700556

Abstract

Electrochemiluminescence (ECL) based on [Ru(bpy)₃ ]²⁺ systems is widely utilized for immunoassays. In order to extend the promising potential of ECL-based applications, Ir^III complexes have recently attracted attention as probes because of their excellent luminescent properties and tunable emission wavelength. Here we describe a series of Ir complexes using a large π-conjugated ligand and different ancillary chelates. The complexes synthesized have been chemically and spectroscopically characterized and used for ECL measurements with annihilation and co-reactant methods. One of the Ir^III complexes investigated exhibits the brightest, ever reported, ECL efficiency in acetonitrile employing the benzoyl peroxide (BPO) co-reactant method.

Keywords: annihilation; benzoyl peroxide; co-reactant; electrochemiluminescence; iridium.