Eu‐based coordination polymer with fluorescence enhancement for Cu 2+ /prochloraz and quenching for nitrobenzene/pyrimethanil

The detection of pollutants is an important part of environmental protection. A one‐dimensional Eu(III) coordination polymer (CP1), [Eu 2 (3‐pyia) 2 (Ac) 2 (H 2 O) 4 ]·(2,2′‐bipy) 0.5 ·4.25H 2 O, based on 5‐(pyridin‐3‐ylmethoxy) isophthalic acid (3‐H 2 pyia) and 2,2′‐bipyridine (2,2′‐bipy) was designed and prepared under hydrothermal condition. The structure was characterized as one‐dimensional ladder‐like structure with water and 2,2′‐bipy guest molecules. The excellent luminescence properties of CP1 prompted us to investigate its fluorescence sensing performance for pollutants. It exhibited fluorescence enhancement for Cu 2+ and prochloraz, but quenching for nitrobenzene and pyrimethanil, and the fluorescence sensing mechanism has been further investigated by experimental and density functional theory (DFT) calculations. This work expands the exploitation of rare earth coordination polymers for fluorescence sensing and contributes to pollutant detection.