Deactivation of the ruthenium excited state by enhanced homogeneous charge transport : implications for electrochemiluminescent thin film sensors

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O'Reilly, Emmet J. and Keyes, Tia E. and Forster, Robert J. and Dennany, Lynn (2018) Deactivation of the ruthenium excited state by enhanced homogeneous charge transport : implications for electrochemiluminescent thin film sensors. Electrochemistry Communications, 86. pp. 90-93. ISSN 1388-2481 (https://doi.org/10.1016/j.elecom.2017.11.020)

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Abstract

The electrochemiluminescent (ECL) performance of three ruthenium-based metallopolymer platforms with different homogeneous charge transfer diffusion coefficients (DCT) is reported. Significantly, simultaneous detection of light and current in tandem with steady-state photoluminescence studies demonstrate that increasing the rate of Ru3+ production via enhanced charge transport results in a decrease in ECL intensity of up to 82% when the concentration of the co-reactant, sodium oxalate, is low, i.e., sub-mM. Spectroelectrochemical studies demonstrate that for maximum sensitivity to be obtained, the electroactive properties of the polymeric support matrix need to be considered in tandem with luminophore, analyte and co-reactant concentrations.

ORCID iDs

O'Reilly, Emmet J., Keyes, Tia E., Forster, Robert J. and Dennany, Lynn ORCID logoORCID: https://orcid.org/0000-0002-5481-1066;
CORE (COnnecting REpositories)