LAUSR

Abstract A new 3D Eu-based coordination polymer, ([Eu(L)(H2O)3]Cl·H2O)n (1) (H2L = (4-(pyridyl-N-oxide)methylphosphonic acid), was successfully self-assembled via diffusion method at room temperature and characterized by single-crystal X-ray diffraction, elemental analyses, powder X-ray diffraction, thermogravimetric analyses and FT-IR. Single-crystal X-ray diffraction analysis shows that 1 features 3D (4,5)-connected (3·4·5·62·7)(32·42·5·63·72) topological framework with large 1D channels. Photoluminescent spectra of 1 exhibit the strong characteristic luminescence of Eu3+. More importantly, sensing experiments exhibit that 1 can be used as a fluorescence sensor for detecting Fe3+ and acetone with excellent sensitivity, great selectivity, reproducibility and low detection limits for Fe3+, and acetone are 0.21 μM and 0.0246 vol%. It is the first example of Eu-based phosphonate sensor for simultaneous detection of Fe3+ and acetone.