Mixed annihilation electrogenerated chemiluminescence of iridium(iii) complexes

Soulsby, L, Hayne, D, Doeven, E, Wilson, D, Agugiaro, J, Connell, T, Chen, L, Hogan, C, Kerr, E, Adcock, J, Donnelly, P, White, J and Francis, P 2018, 'Mixed annihilation electrogenerated chemiluminescence of iridium(iii) complexes', Physical Chemistry Chemical Physics, vol. 20, no. 28, pp. 18995-19006.

Document type: Journal Article
Collection: Journal Articles

Title Mixed annihilation electrogenerated chemiluminescence of iridium(iii) complexes
Author(s) Soulsby, L
Hayne, D
Doeven, E
Wilson, D
Agugiaro, J
Connell, T
Chen, L
Hogan, C
Kerr, E
Adcock, J
Donnelly, P
White, J
Francis, P
Year 2018
Journal name Physical Chemistry Chemical Physics
Volume number 20
Issue number 28
Start page 18995
End page 19006
Total pages 12
Publisher Royal Society of Chemistry
Abstract Previously reported annihilation ECL of mixtures of metal complexes have generally comprised Ir(ppy)3 or a close analogue as a higher energy donor/emitter (green/blue light) and [Ru(bpy)3]2+ or its derivative as a lower energy acceptor/emitter (red light). In contrast, here we examine Ir(ppy)3 as the lower energy acceptor/emitter, by combining it with a second Ir(iii) complex: [Ir(df-ppy)2(ptb)]+ (where ptb = 1-benzyl-1,2,3-triazol-4-ylpyridine). The application of potentials sufficient to attain the first single-electron oxidation and reduction products can be exploited to detect Ir(ppy)3 at orders of magnitude lower concentration, or enhance its maximum emission intensity at high concentration far beyond that achievable through conventional annihilation ECL of Ir(ppy)3 involving comproportionation. Moreover, under certain conditions, the colour of the emission can be selected through the applied electrochemical potentials. We have also prepared a novel Ir(iii) complex with a sufficiently low reduction potential that the reaction between its reduced form and Ir(ppy)3 + cannot populate the excited state of either luminophore. This enabled, for the first time, the exclusive formation of either excited state through the application of higher cathodic or anodic potentials, but in both cases, the ECL was greatly diminished by parasitic dark reactions.
Subject Electroanalytical Chemistry
DOI - identifier 10.1039/c8cp01737a
Copyright notice This journal is © the Owner Societies 2018
ISSN 1463-9076
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