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Luminescence Lifetime-Based Sensing Platform Based on Cyclometalated Iridium(III) Complexes for the Detection of Perfluorooctanoic Acid in Aqueous Samples

Title	Luminescence Lifetime-Based Sensing Platform Based on Cyclometalated Iridium(III) Complexes for the Detection of Perfluorooctanoic Acid in Aqueous Samples
Authors	Kun Zhang, Andrew J. Carrod, Elena Del Giorgio, Joseph Hughes, Knut Rurack, Francesca Bennet, Vasile-Dan Hodoroaba, Stuart Harrad, Zoe Pikramenou
Magazine	Analytical Chemistry
Date	01/16/2024
DOI	10.1021/acs.analchem.3c04289
Introduction	Luminescence lifetimes offer a highly sensitive and stable analytical approach for detection. Iridium probes are known for their luminescence and extended excited-state lifetimes, making them responsive to their immediate surroundings. Perfluorooctanoic acid (PFOA) poses significant toxicological concerns and is recognised as a persistent environmental contaminant. Given stringent regulations on PFOA in drinking water and the widespread environmental pollution from industrial sources or spills, there is an urgent need for swift, straightforward, precise, and economical analytical methods to facilitate its containment. This study presents the development and operation of a new and accessible luminescence sensor for PFOA. The sensor utilises iridium complexes integrated onto gold surfaces. These surfaces were functionalised with lipophilic iridium complexes, specifically IrC6 and IrC12, which incorporate alkyl chains, alongside a Zonyl-FSA surfactant. When PFOA is introduced, the functionalised surfaces (IrC6-FSA@Au and IrC12-FSA@Au) exhibit a pronounced alteration in their red luminescence signal and luminescence lifetime. This change enables the precise monitoring of PFOA concentrations in aqueous solutions. The sensing platform was validated by measuring PFOA in aqueous samples containing known spike concentrations, effectively quantifying PFOA at levels exceeding 100 µg/L (240 nM).
Quote	Kun Zhang, Andrew J. Carrod and Elena Del Giorgio et al. Luminescence Lifetime-Based Sensing Platform Based on Cyclometalated Iridium(III) Complexes for the Detection of Perfluorooctanoic Acid in Aqueous Samples. Analytical Chemistry. 2024. Vol. 96(4):1565-1575. DOI: 10.1021/acs.analchem.3c04289
Element	Iridium (Ir) , Fluorine (F) , Carbon (C) , Oxygen (O)
Materials	Chemical Compounds
Topics	Photonic and Optoelectronic Materials , Smart and Functional Materials
Industry	Research & Laboratory , Chemical & Pharmacy

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