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A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis

Zhang, Xing; Shen, Ling Yi; Zhang, Qi Long; Yang, Xian Jiong; Huang, Ya Li; Redshaw, Carl; Xu, Hong


Xing Zhang

Ling Yi Shen

Qi Long Zhang

Xian Jiong Yang

Ya Li Huang

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Professor Carl Redshaw
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Hong Xu


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.


Zhang, X., Shen, L. Y., Zhang, Q. L., Yang, X. J., Huang, Y. L., Redshaw, C., & Xu, H. (2021). A Simple Turn-off Schiff Base Fluorescent Sensor for Copper (II) Ion and Its Application in Water Analysis. Molecules, 26(5), Article 1233.

Journal Article Type Article
Acceptance Date Feb 20, 2021
Online Publication Date Feb 25, 2021
Publication Date Mar 1, 2021
Deposit Date Feb 26, 2021
Publicly Available Date Oct 27, 2022
Journal Molecules (Basel, Switzerland)
Electronic ISSN 1420-3049
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 26
Issue 5
Article Number 1233
Keywords Organic Chemistry
Public URL


Published article (5.4 Mb)

Copyright Statement
Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).

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