期刊
RSC ADVANCES
卷 3, 期 37, 页码 16802-16809出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra42931h
关键词
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资金
- NSFC [21176029]
- Natural Science Foundation of Liaoning Province [20102004]
- Program for Liaoning Excellent Talents in University [LJQ2012096]
A new fluorescent 2-(2'-aminophenyl)benzimidazole derivatized sensor BMD was designed and synthesized. In CH3CN/H2O (2 : 8, v/v, HEPES 10 mM, pH 7.4) solution, sensor BMD displays two emission bands and exhibits a highly selective and ratiometric response to Zn2+ ions with a distinctly longer-wavelength emission blue shifted through the inhibition of the excited-state intramolecular proton transfer (ESIPT) process. BMD can clearly discriminate Zn2+ from Cd2+ and other metal ions. Moreover, the in situ generated BMD-Zn2+ solution exhibits a highly selective and ratiometric response to S2- among various anions and thiol-containing amino acids via Zn2+ displacement approach, which results in a revival of the ESIPT phenomenon of free BMD. These results demonstrate that BMD can serve as a ratiometric sensor for sequential recognition of Zn2+ and S2- in aqueous solution through inhibition and turn-on of ESIPT process.
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