A novel ratiometric fluorescent sensor based on terpyridine derivatives for Zn2+ in aqueous solution
Qinghong Bai A , Yangming Jiang B C , Enming Hu B C , Libin Lv
A * , Chenghui Wang A and Xin Xiao A *
A
B
C
Abstract
Terpyridine and its derivatives have good binding affinity for most transition metal ions due to the arrangement of their three pyridine nitrogen atoms. In this work, a new ratiometric fluorescent probe G, which is based on a styrylpyridinium attached to a terpyridine fluorophore, was synthesized and characterized. The fluorescence spectrum of probe G shows a good response to Zn2+ by an intramolecular charge transfer effect. On increasing the concentration of Zn2+, the fluorescence color of probe G changes from blue to yellow. Importantly, probe G has a high selectivity for Zn2+and is not affected by other metal ions, including Cd2+. In addition, the limit of detection (LOD) of probe G for Zn2+ was found to be up to 0.17 µM. The results show that probe G has the ability to selectively recognize Zn2+ in aqueous solution.
Keywords: aqueous solution, anti-interference, fluorescent chemosensor, high selectivity, low detection limit, ratiometric fluorescent, terpyridine, Zn2+.
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