A Multifunctional Tb-MOF Detector for H₂O₂, Fe³⁺, Cr₂O₇^2–, and TPA Explosive Featuring Coexistence of Binuclear and Tetranuclear Clusters

Abstract

A novel three-dimensional microporous terbium-(III) metal−organic framework (Tb-MOF) named as [Tb 10 (DBA) 6 (OH) 4 (H 2 O) 5 ]•(H 3 O) 4 (1), was successfully obtained by a solvothermal method based on terbium nitrate and 5-di(2′,4′dicarboxylphenyl) benzoic acid (H 5 DBA). The Tb-MOF has been characterized by single crystal X-ray diffraction, elemental analysis, thermogravimetry, and fluorescence properties, and the purity was further confirmed by powder X-ray diffraction (PXRD) analysis. Structural analysis shows that there are two kinds of metal cluster species: binuclear and tetranuclear, which are linked by H 5 DBA ligands in two μ 7 high coordination fashions into a threedimensional microporous framework. Fluorescence studies show that the Tb-MOF can detect H 2 O 2 , Fe 3+ , and Cr 2 O 7 2− with high sensitivity and selectivity and can also be used for electrochemical detection of exposed 2,4,6-trinitrophenylamine (TPA) in water. The highly selective and sensitive detection ability of the Tb-MOF might make it a potential multifunctional sensor in the future.

A novel 3D terbium metal–organic framework as a heterogeneous Lewis acid catalyst for the cyanosilylation of aldehyde

“…Tb(2) was coordinated with eight oxygen atoms (Tb-O ¼ 2.26-2.53 Å) from four di-monodentate carboxyl groups in different ligands, one bi-dentate carboxyl group, and two water molecules, which was similar to some other works of Tb-MOFs reported before. 27 Tb(1) and Tb(2) were linked through two dimonodentate carboxyl groups and on m 2 -oxygen atom of the didentate carboxy group. The two adjacent Tb(1) centers were bridged by four di-monodentate carboxyl groups, forming a paddle wheel dinuclear Tb(2) core by which the two Tb(1)-Tb(2) units were linked to form a zigzag tetra-nuclear unit.…”

A Water-Stable Lanthanide-Based MOF as a Highly Sensitive Sensor for the Selective Detection of Paraquat in Agricultural Products

“…The peak detected at 510 nm is an overtone peak of the excitation wavelength (254 nm). The green luminescence band at 545 nm has the strongest intensity, originating from the metal–organic framework, which induces a hypersensitive electron transition from 5 D 4 to 7 F 5 . The H 4 btec ligand exhibits an emission peak at 330 nm, which is attributed to the π–π transition .…”

“…The green luminescence band at 545 nm has the strongest intensity, originating from the metal−organic framework, which induces a hypersensitive electron transition from 5 D 4 to 7 F 5 . 56 The H 4 btec ligand exhibits an emission peak at 330 nm, which is attributed to the π−π transition. 57 However, the emission of the ligand was not observed in the solid-state luminescence spectrum of Tb-MOF.…”

Five Mesoporous Lanthanide Metal–Organic Frameworks: Syntheses, Structures, and Fluorescence Sensing of Fe3+, Cr2O72–, and H2O2 and Electrochemical Sensing of Trinitrophenol

“…Therefore, the fluorescence quenching mechanism of this system might be due to the fact that H 2 O 2 of the nucleophile contained unstable O–O bonds, which made the nonbonding orbital and suboxygen atoms form an α effect and further led to the formation of hydrogen bonds between the organic ligands and H 2 O 2 . This weakened the energy transfer from the ligand to Gd 3+ . Subsequently, through analysis of the influence of the concentration of H 2 O 2 on the complex (Figure S7), it could be seen that the luminous intensity of Gd-MOF decayed exponentially with the concentration of H 2 O 2 , and the nonlinear equation was ( R 2 = 0.9986; Figure b).…”