A water-stable uranyl organic framework as a highly selective and sensitive bifunctional luminescent probe for Fe3+ and tetracycline hydrochloride.

Abstract

A new coordination polymer (H2bpy)0.5·[(UO2)1.5(ipa)2(H2O)] (1) (H2ipa = isophthalic acid, bpy = 4,4 -bipyridine) was synthesized by hydrothermal condition. It was characterized by IR spectroscopy, elemental analysis, TG-DTA analysis, and powder X-ray diffraction. Analysis of single crystal X-ray diffraction results showed that the title compound exhibited a double chain bridged by the different uranyl ions and ipa2- ligands. Through the hydrogen bond interactions and π···π stacking interactions, the double chains were assembled into the three-dimensional supramolecular framework. Furthermore, the compound can be used as a promising bifunctional luminescence sensor for detecting and identifying Fe3+ and tetracycline hydrochloride antibiotic molecules with high selectivity and sensitivity in aqueous solutions. Moreover, the luminescent sensing mechanisms for different analytes were speculated. And the electronic properties of title compound were explored by density functional theory (DFT). The sensor system has been successfully applied to the detected of Fe3+ and tetracycline hydrochloride with higher recovery percentages and lower relative standard deviation in the real river water samples.