Abstract
A Rhodamine-based dual chemosensor LI for simultaneously detecting Fe3+ and Cu2+ was designed and synthesized. The spectroscopic properties of LI were analyzed, and its recognition mechanism was speculated. We found that the addition of Fe3+ induced a great fluorescence enhancement, while Cu2+ induced a strong UV-Vis absorption enhancement. The results revealed that LI was highly selective for recognizing Fe3+ and Cu2+ in UV-Vis spectroscopy in CH3OH-H2O (1/1, v/v, pH 7.2) with the interference of other metal ions. A good linear relationship between the fluorescence intensities of LI and the concentration of Fe3+, as well as the UV-Vis absorption intensities of LI and the concentration of Cu2+ was observed, respectively. The detection limit was 9.2 × 10−8 M (5.5 μg/L) for Fe3+ and 3.8 × 10−8 M (2.4 μg/L) for Cu2+, respectively. The detection capacity for targeted metal ions of Fe3+ and Cu2+ were studied, which are less than 5 min. Job's plot method for LI with Fe3+ and ESI-MS for LI with Cu2+ indicated a 1:1 stoichiometry in the complex. The results may provide an effective strategy for the design of new dual chemosensors for the rapid detection of targeted metal ions.
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Acknowledgments
This work is sponsored by the Natural Science Foundation of China (41473071. 41101287). the Chinese Central Level Public Welfare Scientific Research Institutes Foundation for Basic Research & Development (562015Y-3994. 562016Y-4492. 562016Y-4686. 562016Y-4489). the Major Project of College Natural Science Foundation of Jiangsu Province (16KJA610001). the High Level Talent Project of “Six Talents Summit” in Jiangsu Province (JNHB-008). National-Local Joint Engineering Research Center for Biomedical Functional Materials, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Lan, T., Wang, FH., Xi, XJ. et al. A Rhodamine-based Dual Chemosensor for the Simultaneous Detection of Fe3+ and Cu2+. ANAL. SCI. 32, 1223–1229 (2016). https://doi.org/10.2116/analsci.32.1223
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DOI: https://doi.org/10.2116/analsci.32.1223