Enhanced electrochemiluminescence from a stoichiometric ruthenium(II)-iridium(III) complex soft salt
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Electrochemiluminescence (ECL) and electrochemistry are reported for a heterometallic soft salt, [Ru(dtbubpy)3][Ir(ppy)2(CN)2]2 ([Ir][Ru][Ir]), consisting of a 2:1 ratio of complementary charged Ru and Ir complexes possessing two different emission colors. The [Ru]2+ and [Ir]− moieties in the [Ir][Ru][Ir] greatly reduce the energy required to produce ECL. Though ECL intensity in the annihilation path was enhanced 18× relative to that of [Ru(bpy)3]2+, ECL in the co-reactant path with tri-n-propylamine was enhanced a further 4×. Spooling spectroscopy gives insight into ECL mechanisms: the unique light emission at 634 nm is due to the [Ru]2+* excited state and no [Ir]−* was generated in either route. Overall, the soft salt system is anticipated to be attractive and suitable for the development of efficient and low-energy-cost ECL detection systems.
Swanick , K N , Sandroni , M , Ding , Z & Zysman-Colman , E 2015 , ' Enhanced electrochemiluminescence from a stoichiometric ruthenium(II)-iridium(III) complex soft salt ' Chemistry - A European Journal , vol 21 , no. 20 , pp. 7435-7440 . DOI: 10.1002/chem.201406533
Chemistry - A European Journal
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Swanick, K. N., Sandroni, M., Ding, Z. and Zysman-Colman, E. (2015), Enhanced Electrochemiluminescence from a Stoichiometric Ruthenium(II)–Iridium(III) Complex Soft Salt. Chem. Eur. J., which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/chem.201406533/abstract
The authors thank NSERC, CFI, FQRNT, PREA, and The University of Western Ontario for generous financial support to this research.