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A highly Selective Fluorescent Sensor for Monitoring Cu2+ Ion: Synthesis, Characterization and Photophysical Properties

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Abstract

A new fluorescent sensor, 4-allylamine-N-(N-salicylidene)-1,8-naphthalimide (1), anchoring a naphthalimide moiety as fluorophore and a Schiff base group as receptor, was synthesized and characterized. The photophysical properties of sensor 1 were conducted in organic solvents of different polarities. Our study revealed that, depending on the solvent polarity, the fluorescence quantum yields varied from 0.59 to 0.89. The fluorescent activity of the sensor was monitored and the sensor was consequently applied for the detection of Cu2+ with high selectivity over various metal ions by fluorescence quenching in Tris-HCl (pH = 7.2) buffer/DMF (1:1, v/v) solution. From the binding stoichiometry, it was indicated that a 1:1 complex was formed between Cu2+ and the sensor 1. The fluorescence intensity was linear with Cu2+ in the concentration range 0.5–5 μM. Moreso, the detection limit was calculated to be 0.32 μM, which is sufficiently low for good sensitivity of Cu2+ ion. The binding mode was due to the intramolecular charge transfer (ICT) and the coordination of Cu2+ with C = N and hydroxyl oxygen groups of the sensor 1. The sensor proved effective for Cu2+ monitoring in real water samples with recovery rates of 95–112.6 % obtained.

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Acknowledgment

The authors appreciate the financial supports from the National Natural Science Foundation of China (Grant No. 21367017), Natural Science Foundation of Gansu Province (Grant No. 1212RJZA037) and Graduate Student Innovation Projects of Lanzhou Jiaotong University, which resulted in this article. Likewise, the first author thanks the Chinese Scholarship Council for awarding him a scholarship opportunity (CSC No. 2014BSZ528) to conduct his Master’s program in China.

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Authors and Affiliations

  1. School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, P. R. China

    Stephen Opeyemi Aderinto, Yuling Xu, Hongping Peng, Fei Wang, Huilu Wu & Xuyang Fan

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  1. Stephen Opeyemi Aderinto
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  2. Yuling Xu
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  3. Hongping Peng
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Correspondence to Huilu Wu.

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Aderinto, S.O., Xu, Y., Peng, H. et al. A highly Selective Fluorescent Sensor for Monitoring Cu2+ Ion: Synthesis, Characterization and Photophysical Properties. J Fluoresc 27, 79–87 (2017). https://doi.org/10.1007/s10895-016-1936-7

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