1. Ln(III)-MOFs (Ln = Tb, Eu, Dy, and Sm) based on triazole carboxylic ligand with carboxylate and nitrogen donors with applications as chemical sensors and magnetic materials.
- Author
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Yang, Fan, Yang, Guo-Ping, Wu, Yunlong, Yan, Yangtian, Liu, Jiao, Gao, Ruicheng, Zhang, Wen-Yan, and Wang, Yao-Yu
- Subjects
LANTHANUM compounds ,CARBOXYLIC acids ,LIGANDS (Chemistry) ,CARBOXYLATES ,NITROGEN ,CHEMICAL detectors - Abstract
Using a triazole carboxylic ligand (H
2 L = 4-(1H-1,2,4-triazol-1-yl) isophthalic acid), four water-stable lanthanide metal-organic frameworks (Ln(III)-MOFs) (1-Ln, Ln(III) = Tb, Eu, Dy, and Sm), [Ln(L)(HL)(H2 O)2 ], where the deprotonated H2 L ligands have two different coordination modes: L2− and HL− [(a): η2 μ2 χ2 , η2 μ1 χ2 ; (b): η2 μ1 χ2 ], have been synthesized by solvothermal reaction and characterized by elemental analysis, FT-IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analyses show that Ln(III)-MOFs are isostructural with 2D-layered structures with uncoordinated carboxylic and triazole groups. The luminescent properties of 1-Tb in aqueous solution containing different cationic solutions and small organic solvents have been explored under ultraviolet irradiation at room temperature. The high quenching constant KSV values and low detection limits indicate that 1-Tb exhibits extremely high detection sensitivity and selectivity toward Fe3+ ions and nitrobenzene; 1-Tb can keep its original network and be reused after the sensing experiments, which provide us with an optical material for detecting Fe3+ ions and nitrobenzene. Magnetic studies show that antiferromagnetic exchange interactions exist between Dy(III) ions in 1-Dy. [ABSTRACT FROM AUTHOR]- Published
- 2018
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