Construction of a Dual-Function Metal–Organic Framework: Detection of Fe³⁺, Cu²⁺, Nitroaromatic Explosives, and a High Second-Harmonic Generation Response

Abstract

In this work, an Eu 3+ -based dual-function metal−organic framework(1) has been successfully constructed. This compound can effectively detect Cu 2+ , Fe 3+ , and 4-nitrophenol with low detection limits of 18.3, 12.2, and 3.63 ppm, respectively. It also displays a high second-harmonic generation response ca. 2.0 times that of KH 2 PO 4 .

Efficient Detection of Fe3+ and Cr2O72− Ions in Water by Zn-Tetrazolate-Based Two-Dimensional Metal-Organic Framework: A Comparative Study

“…The PXRD patterns of BUT-25 before and after the fluorescence experiments were in accordance with each other, excluding the possibility of structural damage (Figure S1) [12]. The intense color change visible to the naked eye after the fluorescence tests indicates a strong interaction between the MOF and the target ions, as shown in Figures S5b,c, which might be responsible for detecting Cr 2 O 7 2− and Fe 3+ ions [13].…”

Dual-Function Lanthanide–Organic Frameworks Based on a Zwitterionic Ligand as a Ratiometric Thermometer and a Selective Sensor for Nitroaromatic Explosives

“…The excited electrons lying in the higher LUMO of the fluorescent ligand are easily transferred to the lower LUMO of the electron-deficient analytes. 38 After calculation, it can be found that TNP possesses the lowest LUMO energy level, which mostly reduces the energy transferred from ligands to Eu 3+ ions and quenches the fluorescence intensity. The sensing ability of Eu-MOF to TNP was further evaluated.…”

“…Normally, it was believed that such quenching phenomenon mainly results from the electron transfer behavior between the π-conjugated ligand and nitroaromatics. The excited electrons lying in the higher LUMO of the fluorescent ligand are easily transferred to the lower LUMO of the electron-deficient analytes . After calculation, it can be found that TNP possesses the lowest LUMO energy level, which mostly reduces the energy transferred from ligands to Eu 3+ ions and quenches the fluorescence intensity.…”

Recent Advances in Nanocomposite Luminescent Metal-Organic Framework Sensors for Detecting Metal Ions

“…[209] Europium-based MOFs have been extensively used as probes for detecting Fe 3+ ions in solution. [210][211][212][213][214][215][216][217][218] A three-dimensional microporous framework, [(Me 2 NH 2 )Eu 5 (L) 4 (DMA) 4 (H 2 O) 6 ] n , where H 4 L is 1,3-bis-[3,5-bis(carboxy) phenoxy]propane), exhibited a highly selective photoluminescence quenching toward Fe(III) ion. [210] The quenching constant of Fe 3+ is 3500 M −1.…”

“…[210] In addition, the Eu 3+ -based dual-function metal−organic framework [Eu 2 L 2 3+ , and 4-nitrophenol with low detection limits of 18.3, 12.2, and 3.63 ppm, respectively. [211] Another threedimensional europium-based metal−organic framework has been synthesized with 6-[1-(4-carboxyphenyl)-1 H-1,2,3-triazol-4-yl]nicotinic acid as ligand. [212] This compound acts as a dual sensor for the phosphate anion and Fe 3+ ion in aqueous media.…”