Abstract
A cryptand derivative synthesized through imine bond formation was successfully applied for the detection of zinc ion. Its sensing behavior was systematically investigated by UV–Vis, fluorescence spectroscopy, 1H NMR titration and DFT study. This cryptand host was found to be very selective towards zinc ion with high sensitivity in presence of other metal ions. It shows large fluorescence enhancement (more than 70%) on the addition of zinc ion. Limit of detection (LOD) for zinc ion was found to be 1.7 × 10−10 M. TD-DFT calculations were also executed to build up the absorption and oscillator strengths accompanied by the electronic transition properties of the cryptand-zinc complex and showing the interaction via the nitrogen of the cryptand and zinc ion.
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