期刊
ANALYST
卷 141, 期 14, 页码 4388-4393出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6an00657d
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资金
- CSIR [01/2727/13/EMR-II]
- Science & Engineering Research Board, India [SR/S1/OC-62/2011]
- IIT Guwahati
A versatile new fluorogenic Schiff base probe (L) has been synthesized by the reaction of quinoline-2-carbohydrazide (which acts as the chelating site) and 4-dimethylamino cinnamaldehyde (which acts as the signaling unit). L can sense three of the most biologically and environmentally important metal ions, Zn2+, Cd2+ and Pb2+, among various tested metal ions through selective TURN-ON fluorescence responses in physiological pH. Interestingly, L can not only sense Zn2+, Cd2+ and Pb2+ fluorometrically in physiological conditions but can also distinguish one from another by exhibiting individual intrinsic left-right-center TURN-ON emission signal swings. These selective fluorescence responses were explained by a chelation-enhanced fluorescence (CHEF) mechanism. Theoretical calculations were carried out to ascertain the preferred L-metal ion binding mode.
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