Selective fluoride ion sensing using novel quinoline chemosensor insights into kinetics and molecular logic gate functions

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2025年1月13日

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A. V. Ashwathi,
Sabeel M. Basheer

摘要

CQHC, a novel colorimetric fluorescent sensor, developed for the selective sensing of ions and well characterised, including SC-XRD. It demonstrated selective sensing for Co²⁺, Zn²⁺, Hg²⁺ and F^– using absorbance titration at 420 nm, 446 nm and the binding constants estimated follows the order F^– > Co²⁺ > Hg²⁺ > Zn²⁺. On light of this, molecular logic gate was built for CQHC’s selective multi-ion detection. However, fluorescence titration analysis revealed that CQHC is solely selective for F^– ions. This conclusion was validated by ¹H–NMR titration, clearly showed deprotonation occurs from N₃–H. Fluorescent decay titration, kinetic investigations and computational studies all contributed to the selective sensing of F^–. According to TD–DFT calculations, added fluoride ion interacts with N₃–H proton and deprotonates to generate F–H in the excited state.