A turn-off fluorescent probe for the detection of Cu2+ based on a tetraphenylethylene-functionalized salicylaldehyde Schiff-base. (2nd April 2020)

• Record Type: Journal Article
• Authors: Xie, Hai-Fang; Yu, Chang-Jin; Huang, Ya-Li; Xu, Hong; Zhang, Qi-Long; Sun, Xiao-Hong; Feng, Xing; Redshaw, Carl
• Is Part Of: Materials chemistry frontiers. Volume 4:Number 5(2020)
• Page Start: 1500
• Page End: 1506
• Publication Date: 2020-04-02
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c9qm00759h
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : A tetraphenylethylene-functionalized salicylaldehyde Schiff-base fluorescent probe (TPE-An-Py ) with aggregation-induced enhanced emission (AIEE) characteristics exhibited high sensitivity towards copper(ii ) ions in aqueous media with a "turn-off" fluorescence mechanism; limit of detection is 2.36 × 10 −7 mol L −1 . 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 Cu 2+ in practical samples with satisfactory recoveries in a range of 106–111% in lake water and 97–108% in tap water.