Abstract
The fluorescent probe NXZ was synthesized by introducing –OH at position 1, 8-naphthalimide 4-position and benzimidazole unit at 3-position. The Stokes shift (λem − λex) of NXZ can up to 148 nm, when Zn2+ was added to the probe solution, NXZ can quickly form the complex NXZ-Zn2+ with Zn2+ in a ratio of 1: 1 within 55 s, and then quench the fluorescence intensity by 4.4 times. The complexation constant of NXZ and Zn2+ was 1.2 × 104 M−1, and the detection limit for Zn2+ was 40.3 nM, which is much lower than the maximum Zn2+ content (76 µM) stipulated in the World Health Organization (WHO). Exploring the practical application of the probe NXZ found that NXZ can be used for the quantitative detection of Zn2+ in actual water samples and qualitatively detect Zn2+ in bean sprouts samples and Hela cells. In addition, NXZ can also be made into Zn2+ test paper.
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