A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis |
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| Authors: | Xing Zhang Ling-Yi Shen Qi-Long Zhang Xian-Jiong Yang Ya-Li Huang Carl Redshaw Hong Xu |
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| Institution: | 1.The key Laboratory of Environmental Pollution Monitoring and Disease Control, School of Public Health, Ministry of Education, Guizhou Medical University, Guiyang 550004, China;2.School of Basic Medical Science, Guizhou Medical University, Guiyang 550004, China; (L.-Y.S.); (X.-J.Y.); (Y.-L.H.);3.Department of Chemistry, University of Hull, Cottingham Road, Hull, Yorkshire HU6 7RX, UK; |
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| Abstract: | An aniline-functionalized naphthalene dialdehyde Schiff base fluorescent probe L with aggregation-induced enhanced emission (AIEE) characteristics was synthesized via a simple one-step condensation reaction and exhibited excellent sensitivity and selectivity towards copper(II) ions in aqueous media with a fluorescence “ turn-off ” phenomenon. The detection limit of the probe is 1.64 × 10−8 mol·L−1. Furthermore, according to the results of the UV-vis/fluorescence titrations, Job’s plot method and 1H-NMR titrations, a 1:2 stoichiometry was identified. The binding constant between L and Cu2+ was calculated to be Ka = 1.222 × 103. In addition, the AIEE fluorescent probe L could be applied to detection in real water samples with satisfactory recoveries in the range 99.10–102.90% in lake water and 98.49–102.37% in tap water. |
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| Keywords: | synthesis fluorescent probe copper(II) ion AIEE water detection |
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