Abstract
Two luminescent probes [Eu.L¹⁻²]⁺ are reported for the rapid detection of fluoride in water. Probes [Eu.L¹⁻²]⁺ exhibit exceptional enhancements in Eu emission in the presence of fluoride, permitting its selective determination within the environmentally relevant concentration range (20-210 μM).
Highlights
Two luminescent probes [Eu.L1–2]+ are reported for the rapid detection of fluoride in water
Very few probes can detect fluoride ions in a pure aqueous medium;[1] the majority of reported systems are restricted for use in organic solvents such as acetonitrile,[2] DMSO,[3] methanol[4] or dichloromethane,[5] or they require a solvent mixture of organic solvent and water.[6]
The dramatic changes in Eu emission spectral form of [Eu.L1–2]+ observed in the presence of fluoride are indicative of alteration of the Eu(III) metal coordination environment
Summary
Two luminescent probes [Eu.L1–2]+ are reported for the rapid detection of fluoride in water. Fluoride binds reversibly to each probe, displacing the coordinated water, resulting in a 9-fold enhancement in the overall emission intensity and Department of Chemistry, Loughborough University, Leistershire, LE11 3TU, UK. The addition of fluoride resulted in a 9-fold enhancement in the overall emission intensity of [Eu.L1]+, as well as substantial perturbations in the emission spectral form (Fig. 2b).
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