Multifunctional Ln–MOF Luminescent Probe for Efficient Sensing of Fe³⁺, Ce³⁺, and Acetone

Abstract

A new series of five three-dimensional Ln(III) metal-organic frameworks (MOFs) formulated as [Ln(μ-L)(μ-HCOO)(μ-OH)(μ-O)(DMF)(HO)] {Ln = Tb (1), Eu (2), Gd (3), Dy (4), and Er (5)} was successfully obtained via a solvothermal reaction between the corresponding lanthanide(III) nitrates and 2-(6-carboxypyridin-3-yl)terephthalic acid (HL). All of the obtained compounds were fully characterized, and their structures were established by single-crystal X-ray diffraction. All products are isostructural and possess porous 3D networks of the fluorite topological type, which are driven by the cubane-like [Ln(μ-OH)(μ-O)(μ-HCOO)] blocks and μ-L spacers. Luminescent and sensing properties of 1-5 were investigated in detail, revealing a unique capability of Tb-MOF (1) for sensing acetone and metal(III) cations (Fe or Ce) with high efficiency and selectivity. Apart from a facile recyclability after sensing experiments, the obtained Tb-MOF material features a remarkable stability in a diversity of environments such as common solvents, aqueous solutions of metal ions, and solutions with a broad pH range from 4 to 11. In addition, compound 1 represents a very rare example of the versatile Ln-MOF probe capable of sensing Ce or Fe cations or acetone molecules.

A novel nano‐size lanthanum metal–organic framework based on 5‐amino‐isophthalic acid and phenylenediamine: Photoluminescence study and sensing applications

“…Today, many luminescent MOFs have been developed for metal ions sensing. Some of these MOFs have been successfully applied in biological and in environmental samples . Most of the reported MOF sensors are constructed with aromatic poly‐carboxylate ligands, and the mechanism of detection is mainly based on the luminescence quenching of the MOFs by analytes …”

A Water‐Stable Uranyl Organic Framework as a Highly Selective and Sensitive Bifunctional Luminescent Probe for Fe3+ and Tetracycline Hydrochloride

“…Light‐emitting metal organic framework materials (LMOFs) have both organic and inorganic properties, as well as novel and variable topologies. It can be systematically adjusted channels to give them excellent luminescence properties for the design and synthesis of specific fluorescent probes . Since first reported in 2002, MOFs fluorescent probes have mushroomed .…”

“…It can be systematically adjusted channels to give them excellent luminescence properties for the design and synthesis of specific fluorescentp robes. [14][15][16][17] Since first reported in 2002, MOFs fluorescent probes have mushroomed. [18,19] Many probesh ave been used to identify ions, smallo rganic molecules, biomacromolecules, and nitroaromatic explosives et al [20][21][22] Among numerous LMOFs, uranyl fluorescenceM OFs have the following characteristics compared with other LMOFs: [23][24][25][26][27] (1) The fluorescence lifetime is long, which is benefit to time resolution.…”

Performance of metal–organic frameworks for the adsorptive removal of potentially toxic elements in a water system: a critical review

“…In addition to having adsorption applications, MOFs, which contain metal ions with uorescence and luminescence properties, can be used as tracers to detect metal ions in water. 62,63 One reason that MOFs are promising materials for adsorptive removal and separation of contaminants is their multiple pore sizes, which vary from micro to meso-range. 64,65 In contrast to other porous materials such as activated carbon and zeolites, a broad range of pore cavities and functionalities can be seen in MOFs.…”