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New perspectives on the annihilation electrogenerated chemiluminescence of mixed metal complexes in solution

Kerr, Emily, Doeven, Egan, Barbante, Gregory, Hogan, Conor F, Hayne, David, Donnelly, Paul S and Francis, Paul 2016, New perspectives on the annihilation electrogenerated chemiluminescence of mixed metal complexes in solution, Chemical science, vol. 7, no. 8, pp. 5271-5279, doi: 10.1039/c6sc01570k.

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Title New perspectives on the annihilation electrogenerated chemiluminescence of mixed metal complexes in solution
Author(s) Kerr, Emily
Doeven, EganORCID iD for Doeven, Egan
Barbante, Gregory
Hogan, Conor F
Hayne, David
Donnelly, Paul S
Francis, PaulORCID iD for Francis, Paul
Journal name Chemical science
Volume number 7
Issue number 8
Start page 5271
End page 5279
Total pages 9
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2016-01-01
ISSN 2041-6520
Summary Preliminary explorations of the annihilation electrogenerated chemiluminescence (ECL) of mixed metal complexes have revealed opportunities to enhance emission intensities and control the relative intensities from multiple luminophores through the applied potentials. However, the mechanisms of these systems are only poorly understood. Herein, we present a comprehensive characterisation of the annihilation ECL of mixtures of tris(2,2′-bipyridine)ruthenium(ii) hexafluorophosphate ([Ru(bpy)3](PF6)2) and fac-tris(2-phenylpyridine)iridium(iii) ([Ir(ppy)3]). This includes a detailed investigation of the change in emission intensity from each luminophore as a function of both the applied electrochemical potentials and the relative concentrations of the two complexes, and a direct comparison with two mixed (Ru/Ir) ECL systems for which emission from only the ruthenium-complex was previously reported. Concomitant emission from both luminophores was observed in all three systems, but only when: (1) the applied potentials were sufficient to generate the intermediates required to form the electronically excited state of both complexes; and (2) the concentration of the iridium complex (relative to the ruthenium complex) was sufficient to overcome quenching processes. Both enhancement and quenching of the ECL of the ruthenium complex was observed, depending on the experimental conditions. The observations were rationalised through several complementary mechanisms, including resonance energy transfer and various energetically favourable electron-transfer pathways.
Language eng
DOI 10.1039/c6sc01570k
Field of Research 030101 Analytical Spectrometry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID DP160103046
Copyright notice ©2016, Royal Society of Chemistry
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Created: Thu, 13 Oct 2016, 08:06:17 EST

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