biostudies-literatureWang XTChinese Academy of SciencesNational Natural Science Foundation of China6129-6134https://www.ebi.ac.uk/biostudies/studies/S-EPMC9049688biostudies-literatureUnknown10(11)A series of isostructural 3D lanthanide metal-organic frameworks (LnMOFs), with the formula <i>n</i>(H₃O)[Ln(L)(H₂O)] _<i>n</i> ·<i>n</i>H₂O (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 (<i>K</i> _sv = 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.RSC advancesA stable LnMOF as a highly efficient and selective luminescent sensor for detecting malachite green in water and real samples.PMC90496882157117521972060Du SWZhang KWang XTWei WfalseA stable LnMOF as a highly efficient and selective luminescent sensor for detecting malachite green in water and real samples.A series of isostructural 3D lanthanide metal-organic frameworks (LnMOFs), with the formula <i>n</i>(H₃O)[Ln(L)(H₂O)] _<i>n</i> ·<i>n</i>H₂O (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 (<i>K</i> _sv = 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.2020-01-01T00:00:00Z2020 Feb2025-04-05T14:43:11.815Z2025-04-05T14:43:11.815ZS-EPMC90496883549598310.1039/c9ra10870j