A New Diarylethene-based ‘Naked-Eye’ Sensor with a Quinoline Formaldehyde Unit for Fluorescence Turn-off Detection of Cd2+, Cu2+ and Colorimetric Sensing of Cu2+ in its Different Isomers
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https://doi.org/10.54097/q7kx0h73Keywords:
Diarylethene, ‘Naked-eye’ Sensor, Ions RecognitionAbstract
A new asymmetrical diarylethene (1O) with a quinoline formaldehyde unit was synthesized by click chemistry reaction. The results showed that the diarylethene could serve as a highly sensor for fluorescence turn-off detection of Cd2+, Cu2+ in its opened-ring isomers and colorimetric sensing of Cu2+ in its closed-ring isomers in acetonitrile. The 1:1 binding stoichiometry between 1O and Cd2+ or Cu2+ was obtained using Job's plots based on fluorescence titration and ESI-MS analysis. The association constants (Ka) of 1O with Cd2+ and Cu2+ estimated by the Benesi-Hildebrand method were found to be 6.72 × 105 M-1 and 4.21 × 105 M-1, respectively. The detection limit (LOD) was calculated to be 5.2 × 10-5 mol-1 for Cd2+ and 1.3 × 10-5 mol-1 for Cu2+. Furthermore, its closed-ring isomer 1C could be used as a selective ‘naked-eye’ colorimetric sensor for Cu2+, accompanied by a notable color change from purple to colorless.
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