A Multifunctional Fluorescent Sensor Based on Zinc Complex for Selective Detection of Cr3+, Levofloxacin (LVX), and Cysteine (Cys)

Effective detection of pollutants in water is of great significance for environmental detection. In this study, the complex {[Zn(Hbsal)2(dpa)]·2CH3CH2OH}n (1) (H2bsal = 5-bromosalicylic acid, dpa = bis(4-pyridyl)amine) was successfully synthesized by hydrothermal synthesis method. 1 exhibits strong fluorescence emission, excellent anti-interference capability, and good reusability, making it an ideal material for the detection of aqueous-phase pollutants. The experimental results show that 1 has specific sensing recognition for Cr3+, LVX, and Cys, and the limits of detection (LOD) are 2.86 × 10−5 M, 2.51 × 10−5 M, and 5.84 × 10−5 M. These results indicate that 1 can be used as sensing fluorescent probes for Cr3+, LVX, and Cys in aqueous solution and has broad application prospects in environmental detection.