Abstract
Here, three Schiff bases 3a-c, differing by the substitutions (–H, –Cl, and –N(CH3)2) on the phenyl ring, have been designed and synthesized via the reaction of ortho-aminophenol with benzaldehyde, 2,4-dichlorobenzaldehyde and para-dimethylamine benzaldehyde in 1:1 molar ratio with favourable yields of 89–92%, respectively. Their structural characterizations were studied by FT-IR, NMR, MALDI-MS and elemental analysis. The fluorescence behaviours of compounds 3a and 3b exhibited a severe aggregation caused quenching (ACQ) effect in EtOH/water system. On the contrary, compound 3c had an obvious J-aggregation induced emission (AIE) feature in EtOH/water mixture (v/v = 1:1), and exhibited excellent sensitivity and anti-interference towards Cu2+ with the limit of detection (LOD) of 1.35 × 10–8 M. Job’s plot analysis and MS spectroscopic study revealed the 2:1 complexation of probe 3c and Cu2+. In addition, probe 3c was successfully applied to the determination of Cu2+ in real aqueous samples.
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Acknowledgements
We are grateful for the financial support from the Undergraduate Innovation Program in Neijiang Normal University (No. X2021022 and No. X2021179), the Scientific Research Program in Neijiang Normal University (No. X20B0015).
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The study was supported by the Undergraduate Innovation Program in Neijiang Normal University (No. X2021022 and No. X2021179), the Scientific Research Program in Neijiang Normal University (No. X20B0015).
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MC: investigation and formal analysis of optical properties for target compounds; FC: syntheses of the target compounds; SH: investigation of sensing Cu2+; YL: investigation of recovery results of Cu2+ in real water samples; MZ: measurements of spectral properties; MZ: study design and writing-original draft.
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Chen, M., Cao, F., Huang, S. et al. The Schiff Base Probe With J-aggregation Induced Emission for Selective Detection of Cu2+. J Fluoresc 32, 1457–1469 (2022). https://doi.org/10.1007/s10895-022-02948-9
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DOI: https://doi.org/10.1007/s10895-022-02948-9