Abstract: A one-dimensional chain-like uranyl carboxyphosphonate coordination polymer, (UO2)(2-pmbH2)2 (1), was synthesized based on the 2-pmbH3 ligand with UO22+. Where the phosphonate groups bridge uranyl ions through two oxygen atoms to form one-dimensional chains, with protonated carboxyl groups and phosphonate oxygen atoms orderly distributed on both sides of the chain backbone, and interchain hydrogen-bond interactions forming a supramolecular structure. Furthermore, compound ?1? demonstrates ?high aqueous stability(pH=1-12)? and ?favorable photoluminescence properties(QY=14.1 %)?. Analysis of changes in the luminescence intensity of compound ?1? immersed in aqueous solutions containing various metal ions revealed that only Fe3+ induced ?significant quenching (>95% efficiency)? of its ?strongest characteristic emission peak? (λem=524 nm), indicating ?remarkable selectivity?. Establishing a ?quantitative relationship curve? between Fe3+ concentration and luminescence intensity confirmed a ?good linear response? (R2=0.99) ?within the low-concentration range? (0-0.04 mmol·L-1) with a low detection limit (3.6710-7 M). Therefore, ?owing to? its ?unique molecular structure?, favorable photoluminescence properties?, ?high stability in aqueous environments?, as well as its demonstrated ?high selectivity? and ?sensitive quenching response? towards Fe3+ ions, compound ?1? demonstrates excellent performance potential in metal cation sensing and detections.

Key words:

Uranyl carboxyphosphonate coordination polymer, luminescence, Fe³⁺, metal ions detection