Design of an antenna effect Eu(iii)-based metal–organic framework for highly selective sensing of Fe³⁺

Abstract

Highly selective sensing of Fe3+ is very important due to their great effect on biological systems. A novel ligand 1,1':4',1'':4'',1''':4''',1''''-quinquephenyl]-2,2'',2'''',5''-tetracarboxylic acid (H4qptca) was designed and first successfully achieved via three...

Highly Active La(III)‐Based Metal‐Organic Framework as a Heterogeneous Lewis Acid Catalyst for Friedel‐Crafts Alkylation

“…Synthesis and characterization of SLX-2 SLX-2 crystallizes by the solvothermal reaction of H 4 qptca with LaCl 3 • 6H 2 O in the presence of concentrated nitric acid in the mixture solvent of N,N-dimethylformamide and deionized water at 85 °C for 3 days (Scheme 1), with a monoclinic C2/c space group (Supporting Information, Tables S1-S3), different from its analogue, SLX-1, with a triclinic space group. [11] As shown in Figure 1a, the La(III) cation is not only coordinated with six carboxyl O atoms from five fully deprotonated H 4 qptca ligands, but also exhibits metal-metal bonding with the bond distance of 2.2556 Å with another La(III) ion, forming a 7-coordinated capped trigonal antiprism configuration (Figure 1b). The qptca 4À ligand shows bridging fashion coordinating to La(III) ions, in which the carboxyl O1 and O2 atoms on 2 and 2'''' sites, coordinate to four La(III) ions with the LaÀ O bond lengths of 2.402, 2.484, 2.421 and 2.738 Å, respectively.…”

“…SLX‐2 crystallizes by the solvothermal reaction of H 4 qptca with LaCl 3 ⋅ 6H 2 O in the presence of concentrated nitric acid in the mixture solvent of N,N‐dimethylformamide and deionized water at 85 °C for 3 days (Scheme 1), with a monoclinic C2/c space group (Supporting Information, Tables S1‐S3), different from its analogue, SLX‐1, with a triclinic space group [11] …”

“…Furthermore, maybe due to its all carbon and hydrogen skeleton, SLX-1 was very stable toward heat and even harsh acidic and basic environment. [11] Inspired by these results, it is then envisioned that by the reaction of other lanthanide salts with H 4 qptca, it maybe give isostructural MOFs, which will be an efficient Lewis acid catalyst in organic synthesis. Herein, we report the synthesis of a new La-MOF [La 2/ 3 (qptca) 1/2 ] (referred to as SLX-2), by the reaction of LaCl 3 with H 4 qptca under conventional solvothermal conditions.…”

“…In addition, from the crystal structure of SLX‐1, it clearly showed a 2D layer‐by‐layer structure with all the central Eu III metal atoms exposed, which can be potential Lewis acid catalyst. Furthermore, maybe due to its all carbon and hydrogen skeleton, SLX‐1 was very stable toward heat and even harsh acidic and basic environment [11] . Inspired by these results, it is then envisioned that by the reaction of other lanthanide salts with H 4 qptca, it maybe give isostructural MOFs, which will be an efficient Lewis acid catalyst in organic synthesis.…”

Hydrogen-Bond-Connected 2D Zn-LMOF with Fluorescent Sensing for Inorganic Pollutants and Nitro Aromatic Explosives in the Aqueous Phase

“…Metal ions have played an important role in the development of human society for a long time. For example, Fe 3+ , an essential component of hemoglobin, undertakes the duty of oxygen transportation in human body and plays a momentous role in agriculture and industry. − As a potential carcinogen, Cr 6+ also plays an important role in industrial production processes such as ferrochromium smelting, metallurgy, and so forth. − As a result, untreated factory wastewater usually contains these two ions, which cannot be biodegraded and are likely to be enriched in the environment and eventually enter the human body through the food chain, , causing different kinds of diseases. − Therefore, monitoring of Fe 3+ and Cr 2 O 7 2– pollutants is necessarily required because of its enrichment in the environment.…”