Annihilation electrogenerated chemiluminescence of mixed metal chelates in solution: modulating emission colour by manipulating the energetics. Issue 1 (28th October 2014)

• Record Type: Journal Article
• Authors: Kerr, Emily; Doeven, Egan H.; Barbante, Gregory J.; Hogan, Conor F.; Bower, David J.; Donnelly, Paul S.; Connell, Timothy U.; Francis, Paul S.
• Is Part Of: Chemical science. Volume 6:Issue 1(2015:Jan.)
• Page Start: 472
• Page End: 479
• Publication Date: 2014-10-28
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4sc02697g
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : The emissions of the mixed annihilation ECL of metal complexes can be effectively predicted by estimations of reaction exergonicity. Abstract : We demonstrate the mixed annihilation electrogenerated chemiluminescence of tris(2, 2′-bipyridine)ruthenium(ii ) with various cyclometalated iridium(iii ) chelates. Compared to mixed ECL systems comprising organic luminophores, the absence of T-route pathways enables effective predictions of the observed ECL based on simple estimations of the exergonicity of the reactions leading to excited state production. Moreover, the multiple, closely spaced reductions and oxidations of the metal chelates provide the ability to finely tune the energetics and therefore the observed emission colour. Distinct emissions from multiple luminophores in the same solution are observed in numerous systems. The relative intensity of these emissions and the overall emission colour are dependent on the particular oxidized and reduced species selected by the applied electrochemical potentials. Finally, these studies offer insights into the importance of electronic factors in the question of whether the reduced or oxidized partner becomes excited in annihilation ECL.