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Control of excitation and quenching in multi-colour electrogenerated chemiluminescence systems through choice of co-reactant.
journal contributionposted on 2014-10-20, 00:00 authored by Gregory Barbante, N Kebede, Christopher Hindson, Egan DoevenEgan Doeven, Elizabeth Maree Zammit, G R Hanson, C F Hogan, Paul FrancisPaul Francis
We demonstrate a new approach to manipulate the selective emission in mixed electrogenerated chemiluminescence (ECL) systems, where subtle changes in co-reactant properties are exploited to control the relative electron-transfer processes of excitation and quenching. Two closely related tertiary-amine co-reactants, tri-n-propylamine and N,N-diisopropylethylamine, generate remarkably different emission profiles: one provides distinct green and red ECL from [Ir(ppy)3] (ppy=2-phenylpyridinato-C2,N) and a [Ru(bpy)3](2+) (bpy=2,2'-bipyridine) derivative at different applied potentials, whereas the other generates both emissions simultaneously across a wide potential range. These phenomena can be rationalized through the relative exergonicities of electron-transfer quenching of the excited states, in conjunction with the change in concentration of the quenchers over the applied potential range.
Pagination14026 - 14031
Publication classificationC Journal article; C1 Refereed article in a scholarly journal
CategoriesNo categories selected
co-reactantselectrogenerated chemiluminescenceelectron transferiridiumrutheniumScience & TechnologyPhysical SciencesChemistry, MultidisciplinaryChemistryINHIBITED RU(BPY)(3)(2+) ELECTROCHEMILUMINESCENCEELECTROCHEMICALLY GENERATED CHEMILUMINESCENCEVISIBLE-LIGHT PHOTOCATALYSISPHOTOREDOX CATALYSISIRIDIUM(III) COMPLEXESSELECTIVE EXCITATIONTERTIARY-AMINESRUTHENIUM(II)DEPROTONATIONMECHANISM