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Issue 20, 2018
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Two new quinoline-based regenerable fluorescent probes with AIE characteristics for selective recognition of Cu2+ in aqueous solution and test strips

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Abstract

Two novel highly selective quinoline-based fluorescent probes (1 and 2) with an aggregation induced emission (AIE) feature have been designed and synthesized for the rapid analysis of Cu2+ ions in aqueous media and on paper strips with a fluorescence quenching mechanism. Moreover, probes 1 and 2 exhibit excellent sensitivity and anti-interference for Cu2+ detection, and the detection limits are as low as 1.3 × 10−8 M and 8.5 × 10−8 M, respectively, which are much lower than the allowable standard of Cu2+ (∼20 μM) in drinking water (EPA). More importantly, these two probes were successfully applied for the determination of Cu2+ in real aqueous samples and fabrication of simple device test strips for rapid and on-site detection of Cu2+ ions. Interestingly, they can also be regenerated by adding an excess of S2−. Additionally, the crystallographic structure of probe 1 was confirmed through a single crystal X-ray study. Job's plot analysis and ESI-MS spectroscopic studies reflect the 1 : 1 complexation of the 1–Cu2+ and 2–Cu2+ complexes. Furthermore, DFT/TDDFT calculations were performed in order to help in understanding the electronic properties of the complexes and the chelation-induced quenching mechanism.

Graphical abstract: Two new quinoline-based regenerable fluorescent probes with AIE characteristics for selective recognition of Cu2+ in aqueous solution and test strips

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Publication details

The article was received on 21 May 2018, accepted on 29 Jul 2018 and first published on 01 Aug 2018


Article type: Paper
DOI: 10.1039/C8AN00940F
Citation: Analyst, 2018,143, 4870-4886
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    Two new quinoline-based regenerable fluorescent probes with AIE characteristics for selective recognition of Cu2+ in aqueous solution and test strips

    J. Xiong, Z. Li, J. Tan, S. Ji, J. Sun, X. Li and Y. Huo, Analyst, 2018, 143, 4870
    DOI: 10.1039/C8AN00940F

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