Bifunctional luminescent Eu metal–organic framework for sensing nitroaromatic pollutants and Fe³⁺ ion with high sensitivity and selectivity

Abstract

In recent years, heavy metal ions and nitroaromatic explosives in environmental pollutants have been a serious threat to human health due to their high toxicity, carcinogenicity, and nondegradability. The detection of metal ions and nitroaromatics has become an urgent problem. In this paper, a new water stable luminescent Eu‐based metal–organic framework ([Eu(L)(DMF)2]n) was prepared by the reaction of rigid ligand H3L (3,5‐bis‐(3‐carboxyphenoxy)benzoic acid) and Eu (NO3)3·6H2O under solvothermal conditions. Luminescent detection of the nitroaromatic compounds and metal ions showed that the complex had high sensitivity to Fe3+, o‐nitrophenol, p‐nitrophenol, and m‐nitrophenol.

Tracking the Stepwise Formation of a Water-Soluble Fluorescent Tb12 Cluster for Efficient Doxorubicin Detection

“…Compared with organic molecules, fluorescent metal complexes, especially lanthanide metal complexes, with a large stoke shift, narrow emission bands, and long luminescence lifetime, − have been applied as a fluorescent probe. Currently, two types of lanthanide metal complexes (metal–organic frameworks (MOFs) and clusters) are widely used for the detection of cations, − anions, − biomarkers, − and explosives. − Compared with the fluorescent MOFs with poor water solubility, it is of great significance to synthesize a water-soluble fluorescent lanthanide clusters with high sensitivity and selectivity in the field of bio-substance (e.g., DOX) determination.…”

Cinnamal Sensing and Luminescence Color Tuning in a Series of Rare-Earth Metal−Organic Frameworks with Trans-1,4-cyclohexanedicarboxylate

“…The sufficient porosity of the coordination frameworks [Ln 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ], coupled with their remarkable luminescence properties, suggest a further investigation of a guest-dependent luminescence for sensing applications. For example, the nitroaromatic organic molecules, being electron-deficient species, often quench the luminescence of the porous MOFs due to efficient charge transfer [ 60 , 61 , 62 , 63 , 64 , 65 , 66 ]. Preliminary experiments with single-metal compounds [Eu 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ]∙2DMF ( 2 ) and [Tb 2 (phen) 2 (NO 3 ) 2 (chdc) 2 ]∙2DMF ( 3 ), wetted by the different liquids indicated modest dependence of the luminescence of 2 and several examples of noticeable quenching of the luminesce in case of 3 .…”

Photonic Crystals Based on ZIF-8 Nanoparticles with Embedded Carbon Dots for Optical Information Encryption

“…Nevertheless, effective carriers that are capable of maintaining the intrinsic fluorescence property of fluorescent materials and assembling into periodic structures to form dual-mode PCs are still required. Metal–organic frameworks (MOFs) are heterogeneous microporous crystalline materials formed by metal ions/clusters with organic ligands and have been widely used in diverse applications such as chemical separation, photocatalysis, fuel cells, sensing, , and molecular transport . Recently, due to the outstanding advantages of MOFs, including tunable shape, large pore size, and porous structure, they have been used as chemical substances loading materials for chemodynamic therapy, nanocatalytic medicine, and drug delivery system .…”