期刊
JOURNAL OF LUMINESCENCE
卷 209, 期 -, 页码 411-419出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2019.02.024
关键词
Mercury ions; Colorimetric probe; Fluorescence probe; Naked-eye
类别
资金
- National Natural Science Foundation for Young Scientists of China [21301150, 21571154]
- Post-Doctoral Foundation of Jiangsu Provincial [1501032B]
- Practice Innovation Training Program Projects for the Jiangsu College Students [201610324021Z]
- Six Talent Peaks Project in Jiangsu Province [SWYY-063]
- Qing Lan Project of Jiangsu Province
Three new rhodamine based probes 1, 2, 3 were synthesized and acted as fluorescence probes for Hg2+ detection in Tris - HCl/C2H5OH (v: v = 3: 7, 10 mM, pH = 7.2). Hg2+ induced a colorless solution of probes 1, 2, 3 to turn to naked-eye visible pink with a 44 - fold fluorescence enhancement at 576 nm. Probes 1, 2, 3 are highly selective to Hg2+ over other tested cations with the detection limits are 18 nM, 16 nM, 56 nM, respectively. What's more, the binding constants between probes 1, 2, 3 and Hg2+ are 5.0 x 10(6) M-1, 1.8 x 10 6 M -1 1.5 x 10(6) M-1, respectively. The different detection limits and binding constants of probes 1, 2, 3 and Hg2+ may depend on the coordination of probes 1,2, 3. The recognition mechanism of probes 1,2, 3 towards Hg2+ is determinated by ESI - MS, DFT and indicates that a ring-opening of the spirolactam unit and formed complexes between probes 1, 2, 3, resulting in chromogenic and fluorogenic changes. The probes 1, 2, 3 could be applied in both environmental and Hg(2+ )polluted samples due to the instantly and reversible off-on Hg2+ response, well cell permeability, cell imaging ability.
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