A selective fluorescent sensor for Hg²⁺ based on covalently immobilized naphthalimide derivative

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• 作者：Xue-Fen WuAuthor Vitae ; Qiu-Juan Ma ; ^{maqiujuan104@yahoo.com.cn}Author Vitae ; Xiao-Jie WeiAuthor Vitae ; Yi-Min HouAuthor Vitae ; Xin ZhuAuthor Vitae
• 关键词：Fluorescent sensor ; Hg2+ ; Naphthalimide derivative ; Covalent immobilization ; Fluorescence enhancement
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：5 July, 2013
• 年：2013
• 卷：183
• 期：Complete
• 页码：565-573
• 全文大小：1396 K

文摘

In this work, a selective fluorescent sensor for Hg²⁺ detection in aqueous solution, which contains a naphthalimide derivative covalently grafted to the glass surface, was developed. To fabricate the sensor, the naphthalimide derivative (compound 1) with a terminal double bond was prepared and photo-copolymerized with 2-hydroxyethyl methacrylate (HEMA) on the glass surface treated with a silanizing agent. Upon binding mercuric ions in 0.05 mol/L Tris/HCl (pH 7.01) at 25 ¡ãC, the resulting optical sensor undergoes fluorescence enhancement. Thus, the proposed sensor with visible excitation can behave as a fluorescent sensor for the selective detection of Hg²⁺. The fluorescence enhancement was induced by a photo-induced electron transfer (PET) inhibition process. In addition, the proposed sensor showed satisfactory selectivity, reproducibility and response time. The sensing membrane possesses a relatively long lifetime of at least 2 months. The chemosensor can be applied to the quantification of Hg²⁺ with a linear range covering from 6.0 ¡Á 10^-6 to 2.0 ¡Á 10^?4 M and a detection limit of 2.0 ¡Á 10^?6 M. The determination of Hg²⁺ in river water samples shows satisfactory results.