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A mixed valence Tb(III)/Tb(IV) metal-organic framework: Crystal structure, luminescence property and selective detection of naproxen
摘要： A mixed valence terbium metal-organic framework (MOF), [Tb2(HCOO)(clhex)·2H2O)]·2H2O (BUC-68) was obtained from the reaction of 1,2,3,4,5,6-cyclohexanehexacarboxylic acid (H6clhex), formic acid, N,N-dimethylformamide (DMF) and the terbium salt under hydrothermal condition at 140 ℃. The crystallographic analysis revealed that the three-dimensional BUC-68 is composed of two-dimensional [Tb2(clhex)·2H2O)] sheets linked by formic ligand. X-ray photoelectron spectra (XPS) analysis revealed that there were terbium (III) and terbium (IV) presented in BUC-68. Thermogravimetric analysis (TGA) indicated that BUC-68 was stable up to 350 ℃. Photoluminescent measurement showed that BUC-68 displays strong luminescence emission, which was arose from efficient ligand to metal energy transfer transitions. Finally, BUC-68 was utilized to conduct selective detect of naproxen (NPX) and some small organic molecules.
关键词： naproxen,Metal-organic framework,selective detection,luminescence sensor,mixed valence
更新于2025-09-23 15:19:57
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Four new luminescent-organic frameworks exhibiting highly sensing of nitroaromatics: an experimental and computational insight
摘要： Four new metal–organic frameworks (MOFs) namely {[Cd(L)(bpp)]·H2O}n (1), {[Zn(L)(bpp)]·H2O}n (2), {[Cd(L)(bpz)]·H2O}n (3), [Zn(L)(bib)(H2O)]n (4), (H2L = 1,4-bis(4-carboxylbenzyl)piperazine acid; bpp =1,3-bis(4-pyridyl)propane; bpz = 3,3′,5,5′-tetramethyl-4,4′-bipyrazole, bib = 1,4-bis(imidazol-1-yl)butane)) have been designed, synthesized and characterized. The MOFs 1 and 2 are isostructural and possess 4-connected dia topology with rare 8-fold interpenetrating network. In 3, the dianionic ligand L and bpz ligands link binuclear Cd(II) centres to generate a 2D layer framework with a double stranded chain. While in 4, the Zn(II) centres are bridged by L and bib ligands to furnish a 2D framework, which further generates a 3D supramolecular structure through the hydrogen bonding interactions formed between coordinated water molecules and carboxylate groups. The MOF 1 have been utilized as a possible luminescent sensor to detect nitroaromatic compounds (NACs). The results indicates that 1 showed good sensitivity towards p-nitrophenol (PNP) in comparison to other NACs by the decline in its luminescent intensity. The detection limit for PNP was found to be extremely low(1.27 ppm in solution) which represents one of the most efficient MOF-based sensors for PNP. The most plausible mechanism associated with sensing have been explained with the aid of theoretical calculations which indicated that a simultaneous electron/energy transfer phenomenon operating between 1 and NACs contributes toward the decline in the luminescence intensity
关键词： Nitroaromatic,Luminescence sensor,MOFs,Theoretical calculation
更新于2025-09-04 15:30:14