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A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base

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Abstract

A non-planar tetraphenylethylene-functionalized salicylaldehyde Schiff-base fluorescent probe (TPE-An-Py) with aggregation-induced enhanced emission (AIEE) characteristics was synthesized via a classical Knoevenagel condensation reaction, and exhibited a high sensitivity towards copper ions in aqueous media with a “turn-off” fluorescence mechanism; the limit of detection is 2.36 × 10−7 mol L−1. Importantly, the coordination mode of the probe towards copper was further evaluated by UV-vis and NMR spectroscopy and a 1 : 2 stoichiometry was identified. A single crystal X-ray diffraction study confirmed the binding mode. In addition, the AIEE fluorescent probe can be applied to the detection of Cu2+ in practical samples with satisfactory recoveries in a range of 106–111% in lake water and 97–108% in tap water.

Graphical abstract: A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base

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Article information


Submitted
13 Dec 2019
Accepted
25 Mar 2020
First published
26 Mar 2020

Mater. Chem. Front., 2020, Advance Article
Article type
Research Article

A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base

H. Xie, C. Yu, Y. Huang, H. Xu, Q. Zhang, X. Sun, X. Feng and C. Redshaw, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QM00759H

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