期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 415, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2021.113307
关键词
Cadmium ion; Coordination complex; Fluorescent dye; Optical sensor; Zinc ion
资金
- Thailand Research Fund [MRG5980037, RTA6180007]
- Thailand National Nanotechnology Center (NANOTEC), NSTDA
- Ministry of Science and Technology, Thailand, through its program of Research Network NANOTEC (RNN)
- Science Achievement Scholarship of Thailand (SAST)
By synthesizing a series of quinoline-pyridine conjugates, the effects of amino protons and number of N-donor atoms on the binding of Cd2+ and Zn2+ were studied, revealing that the Cd2+/Zn2+ binding ratio can be tuned by ligand design.
Zn2+ and Cd2+ are d10 metal ions with very different toxicity level but similar binding properties to most organic ligands. Herein, a series of quinoline-pyridine conjugates are synthesized and evaluated for binding properties on both metal ions. The effects of amino protons and number of N-donor atoms on the ligands binding to Cd2+ and Zn2+ were studied by UV-vis titration in aqueous solution. The association constant for Cd2+ is affected by amino protons and denticity of the ligands greater than that of Zn2+. As the results, the Cd2+/Zn2+ binding ratio can be tuned by the ligand design. L6, the ligand with 6 N atoms without the proton, exhibits the highest Cd2+/Zn2+ binding ratio with fluorescence enhancement at 480 nm. The ligand can be used for detecting Cd2+ with the detection limit of 69 nM in aqueous solution and monitoring Cd2+ within cells at the concentration range of 0.1-10 mu M.
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