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| Synthesis of a Fluorescence Probe Based on 8-Hydroxyquinoline Derivative and Its Application in Mg2+ Ion Detection |
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| DOI： |
| KeyWord:fluorescence probe 8-hydroxyquinoline Mg2+ ion Schiff-base |
| Author | Institution |
| FU Zhen-hai，WANG Min，LI Zhi-wei，QIN Jing-can，SU Tong，ZHANG Zhi-hong |
1. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources，Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining ，China; 2. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province，Xining ，China; 3. University of Chinese Academy of Sciences，Beijing ，China |
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| Abstract: |
| A fluorescence probe was designed and synthesized by the reaction between 8-hydroxyquinoline-5-carbaldehyde and benzohydrazide in this work，which was characterized by 1H NMR， 13C NMR and MS，and then employed in the selective fluorescence detection of Mg2+ ion．All experimental results showed that the probe exhibits a good selectivity towards Mg2+ ion by using fluorescence enhancement at 577 nm in DMSO－HEPES buffer solution（20 mmol/L，pH 7.0，95∶5，by volume），with a detection limit for Mg2+ ion as low as 8.2 × 10－8 mol/L．In addition，the probe could also be used to detect Cd2+ ion or Zn2+ ion at the wavelengths of 604 nm and 611 nm．Theoretical calculation demonstrated that，after the formation of a 2∶1 stoichiometric complex between probe and Mg2+ ion，the electron density mainly concentrated around Mg2+ ion，resulting in the fluorescence enhancement due to the smaller energy gap of probe + Mg2+ system. |
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