‘Turn‐on’ fluorescent chemosensors based on naphthaldehyde‐2‐pyridinehydrazone compounds for the detection of zinc ion in water at neutral pH |
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| Authors: | Yuanyuan Liu Yuanyuan Li Qi Feng Na Li Kai Li Hongwei Hou Bing Zhang |
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| Institution: | 1. College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, P. R. China;2. School of Chemical Engineering and Energy, Zhengzhou University, Henan, P. R. China;3. College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Henan, P. R. China;4. Department of Pharmacy, Women & Infants Hospital of Zhengzhou, Henan, P. R. China |
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| Abstract: | A series of naphthaldehyde‐2‐pyridinehydrazone derivatives were discovered to display interesting ‘turn‐on’ fluorescence response to Zn2+ in 99% water/DMSO (v/v) at pH 7.0. Mechanism study indicated that different substituent groups in the naphthaldehyde moiety exhibited significant influence on the detection of Zn2+. The electron rich group resulted in longer fluorescence wavelengths but smaller fluorescence enhancement for Zn2+. Among these compounds, 1 showed the highest fluorescence enhancement of 19‐fold with the lowest detection limit of 0.17 μmol/L toward Zn2+. The corresponding linear range was at least from 0.6 to 6.0 μmol/L. Significantly, 1 showed an excellent selectivity toward Zn2+ over other metal ions including Cd2+. |
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| Keywords: | chemosensor fluorescence turn‐on zinc ion |
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