Four New 3D Metal–Organic Frameworks Constructed by a V-shaped Tetracarboxylates Ligand: Selective CO₂ Sorption and Luminescent Sensing

Abstract

Employing a V-shaped rigid multicarboxylate ligand 1,3-di­(2′,5′-dicarboxypheny)­benzene acid (H4L), three microporous metal–organic frameworks (MOFs), H2[Co4(O)­L2(H2O)2]·3DMA·8H2O (1), H3[Zn2.5L2]·NMP·5H2O (2), and H3[Cd2.5L2]·4DMF·3H2O (3) were synthesized and characterized. Compound 1 exhibits a cage-based (3,6)-connected rtl topological MOF with [Co4O­(COO)8] clusters and highly selective adsorption of CO2 over CH4. Compounds 2 and 3 are isostructural and display a rare 4,8-connected flu net with linear trinuclear [Zn3(COO)6] clusters. Interestingly, when compound 3 was soaked in DMF solution containing Eu3+ ions, an Eu-loaded compound Eu@3 with bright red fluorescence was obtained, which reveals highly selective sensing for Cu2+, Fe3+, and Cr2O7 2– ions. This represents an unusual example to achieve the detection of Cu2+, Fe3+, and Cr2O7 2– ions simultaneously by fluorescence spectrometry based on a recyclable Eu-loaded MOF sensor.

Four New Stable Lanthanide Organic Frameworks: Highly Selective Luminescent Sensing and Magnetic Properties

“…The K sv value is calculated to about 7510.4, which is comparable with or better than those previously reported well‐designed compounds for sensing Cr 2 O 7 2− ions . The limit of detection (LOD) determined following the 3δ IUPAC criteria can reach 5.99 × 10 −4 M . To further explore its high selectivity for Cr 2 O 7 2− and CrO 4 2− , The quenching experiment about Cr 2 O 7 2− and CrO 4 2− in the presence of other anions were performed (Figure and Figure S15c in the Supporting Information).…”

Two d10 luminescent metal–organic frameworks as dual functional luminescent sensors for (Fe3+,Cu2+) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity

“…S5 and S7 † ), as far as we know, the K sv value is larger than other reported sensors, that is to say, activated 1a and 2b can not only detect of Cu 2+ ions, but also show high sensitivity. 55–57 …”

“…S5 and S7 †), as far as we know, the K sv value is larger than other reported sensors, that is to say, activated 1a and 2b can not only detect of Cu 2+ ions, but also show high sensitivity. [55][56][57] Fortunately, the luminescence intensity of activated 1a and 2b were easily recovered centrifuging the suspensions aer sensing Fe 3+ or Cu 2+ ions, and washing more than three times using DMF solvent. Signicantly, the samples can be regenerated, the framework retained its structural integrity, and reused for ve cycles and the quenching efficiency of the ve cycles maintain high values (Fig.…”

8-Hydroxyquinolinate-Based Metal–Organic Frameworks: Synthesis, Tunable Luminescent Properties, and Highly Sensitive Detection of Small Molecules and Metal Ions

“…Because of the various applications in sensing and detection, photochemistry, and optoelectronic display devices, luminescent MOFs with d 10 metals have attracted wide attention . Therefore, the solid-state luminescent behavior of complexes 1 – 3 and the free ligand H 2 L was studied at ambient temperature.…”