A stable LnMOF as a highly efficient and selective luminescent sensor for detecting malachite green in water and real samples |
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| Authors: | Xue-Ting Wang Wei Wei Kai Zhang Shao-Wu Du |
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| Affiliation: | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou Fujian 350002 China ; Provincial Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou Fujian 350108 China.; University of Chinese Academy of Sciences, Beijing 100049 P. R. China |
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| Abstract: | A series of isostructural 3D lanthanide metal–organic frameworks (LnMOFs), with the formula n(H3O)[Ln(L)(H2O)]n·nH2O (Ln = Gd 1, Eu 2 and Tb 3, H4L = 3,5,3′,5′-oxytetrabenzoic acid), have been successfully synthesized by solvothermal reactions. Single-crystal X-ray diffraction analysis reveals that 1–3 are constructed from wave-like Ln–carboxylate chains which are further connected by the ligands to form 3D channel-type frameworks. Further experiments suggest that 3 is thermally stable up to 322 °C and exhibits outstanding chemical stability in aqueous solutions with the pH ranging from 3 to 11. Significantly, 3 can be utilized for the first time to detect malachite green (a synthetic antibiotic to cure saprolegniasis) in aqueous media even in the presence of other interfering antibiotics, with a high sensitivity (Ksv = 8.33 × 104 M−1), low detection limit (DL = 0.25 μM) and good recyclability. On a more practical note, we found that the luminescence intensity of 3 showed almost no response to pH changes (pH 3–11), allowing steady sensing in real samples such as river water, simulated human serum and urine with satisfactory recoveries and RSD.A Tb-MOF with chemical stability was synthesized. It showed excellent luminescent sensing for MG in river water, simulated serum and urine. |
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