A Europium-based MOF Fluorescent Probe for Efficiently Detecting Malachite Green and Uric Acid

Abstract

Lanthanide (such as Tb and Eu) metal–organic frameworks (MOFs) have been widely used in fluorescent probes because of their multiple coordination modes and brilliant fluorescence characteristic. Many lanthanide MOFs were applied in detecting metal ions, inorganic anions, and small molecules. However, it’s rarely reported that Ln-MOF was devoted to detecting malachite green (MG) and uric acid (UA). We prepared a europium-based metal–organic framework (Eu-TDA) (TDA = 2,5-thiophenedicarboxylic acid group). Luminescence studies demonstrated that Eu-TDA can rapidly detect MG and UA with excellent selectivity and sensitivity, where individual quenching efficiency K sv (MG: 5.8 × 105 M–1; UA: 4.15 × 104 M–1) and detection limit (MG: 0.0221 μM; UA: 0.689 μM) were regarded as the excellent MOF sensors for detecting MG and UA. The quenching of Eu-TDA’s fluorescence emission by MG and UA was likely due to the spectral overlap, energy transfer, and competition. Among 11 metal cations and 14 anions, Eu-TDA can quickly and effectively recognize MG and UA with highly selective and sensitive properties. Our method possesses potential application in detecting UA in human blood and MG in the fishpond.

Lanthanide-based metal–organic framework materials as bifunctional fluorescence sensors toward acetylacetone and aspartic acid

“…10–24 Many Ln-MOFs have been applied to detect metal cations, inorganic anions and small organic molecules. 25,26 However, there are few reports of Ln-MOFs for the detection of amino acids. 27,28…”

Uncoordinated‐substituents‐induced zinc(II) coordination polymers exhibiting multifunctional fluorescent sensing activity for cations, anions and organochlorine pesticides

“…Therefore, the UV‐Vis absorption spectra of these substances were recorded. Figure S12 shows that the absorption spectra of five analytes overlap with the emission spectra of 1 , which proves that their quenching mechanism is energy competitive absorption, which leads to resonance energy transfer [56,57] . In addition, the fluorescence lifetime of 1 was measured before and after the addition of analytes.…”

“…Figure S12 shows that the absorption spectra of five analytes overlap with the emission spectra of 1, which proves that their quenching mechanism is energy competitive absorption, which leads to resonance energy transfer. [56,57] In addition, the fluorescence lifetime of 1 was measured before and after the addition of analytes. The lifetimes are as follows: 5.35 ns (CP 1), 5 S13 that there is no effective overlap between CP 1 and these analytes, which can be explained by the dynamic quenching effect (DQE) mechanism.…”

Nanoscale Metal-Organic Frameworks as Fluorescence Sensors for Food Safety

“…Food additives play an essential role in maintaining or enhancing safety, nutritional value, appearance, texture, freshness, and other characteristics of food. However, the abuse of food additives would result in a severe threat to both humans and animals [52], which cause concerns about food safety from people. Therefore, it is urgent to develop sensitive, rapid, and simple detection methods for various food additives.…”