Luminescence Turn-on of Lanthanide Coordination Polymers Triggered by Norfloxacin for Visual Detection and...

Norfloxacin (NOR) has raised growing concerns over food safety and environmental sustainability due to its persistence and bioaccumulation. The luminescence turn-on effect induced by NOR offers a promising approach for the development of advanced sensing platform and anticounterfeiting platform. In this work, two novel one-dimensional chain-like lanthanide coordination polymers, Tb-TCDA and Eu-TCDA, were successfully synthesized through a facile one-step hydrothermal approach. Interestingly, Tb-TCDA demonstrates a pronounced luminescence turn-on effect upon reaction with NOR, functioning as a highly selective and sensitive probe for NOR detection, with a detection limit as low as 0.03 μM and a rapid response time (<20 s). The sensing performance is maintained in complicated real-world matrices, including dairy products (milk, eggs), lake water, and tap water. Notably, portable test strips fabricated by immobilizing Tb-TCDA onto filter paper enable on-site visual identification of NOR contamination within minutes, demonstrating excellent practicality. In addition, the stimuli-responsive luminescence turn-on behavior of Tb-TCDA and Eu-TCDA supports their potential application in advanced anticounterfeiting technologies. This work provides a dual-functional platform that integrates luminescence sensing and security features, offering new opportunities for real-time antibiotic monitoring and anticounterfeiting systems.