Control of excitation and quenching in multi-colour electrogenerated chemiluminescence systems through choice of co-reactant
Date
2014
Authors
Barbante, G.J.
Kebede, N.
Hindson, C.M.
Doeven, E.H.
Zammit, E.M.
Hanson, G.R.
Hogan, C.F.
Francis, P.S.
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Journal article
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Chemistry - A European Journal, 2014; 20(43):14026-14031
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Abstract
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.
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Copyright 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim