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

Abstract

Two novel highly selective quinoline-based fluorescent probes (1 and 2) with aggregation induced emission (AIE) feature have been designed and synthesized for the rapid analysis of Cu2+ ions in aqueous media and on paper strips by fluorescence quenching mechanism. Moreover, probes 1 and 2 exhibit excellent sensitivity and anti-interference to 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 to 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 be also regenerated by adding an excess of S2-. Additionally, the crystallographic structure of probe 1 was confirmed through 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 understand the electronic properties of complexes and chelation induced quenching mechanism.

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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, Accepted Manuscript
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    Two new quinolone-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, Accepted Manuscript , DOI: 10.1039/C8AN00940F

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