Multifunctional Luminescent 3D Ln-MOFs with High Sensitivity for Trace Detection of Micronutrients

Abstract

The synthesis of two versatile fluorescent metal−organic frameworks (MOFs), 1,4-H 2 bdc = benzene-1,4-dicarboxylic acid, 4,4′-H 2 bpdc = 4,4′-biphenyldicarboxylic acid), was carried out using a hydrothermal method. These MOFs were characterized through various advanced technologies to determine their structural information. The results indicate that both MOFs exhibited 3D network structures with specific topologies. Furthermore, these MOFs demonstrated exceptional thermal stabilities and adsorption capabilities. Additionally, complex 2 was utilized for studying the fluorescence sensing properties of various micronutrients including metal ions, nitro aromatic compounds, and biological small molecules. Notably, complex 2 showed promising potential as a multifunctional sensor for selectively detecting Fe 3+ , nitrobenzene, and ascorbic acid in aqueous solutions through fluorescence quenching with low limits of detection (LODs ∼ 10 −7 M) and high quenching constants (K sv ∼ 10 3 M −1 ). Moreover, the detection mechanism of complex 2 was further investigated by using experimental methods and DFT calculations.

Stable Europium(III) Metal–Organic Framework Fluorescence Probe for Intelligent Visualization Detection of Gossypol and Nitrofuran Antibiotics in Real Samples

“…The wavenumber of 2929 cm –1 was attributed to the stretching vibration of unsaturated C–H bonds The peak at 1662, 1582, and 1407 cm –1 corresponded to asymmetric and symmetric stretching vibrations of –COO – , and 473 cm –1 for Eu–O stretching vibration (Figure S1). , …”

Porphyrin-based metal–organic frameworks for photo(electro)catalytic CO2 reduction

“…41 With thorough research on the properties and synthesis strategies of MOFs, more outstanding merits have been discovered for their application in the field of energy conversion, gas storage, separation, and sensors. 42,43 These merits can be attributed to their large specific surface area, tunable open channels, and abundant active sites. 44 In addition, the flexible composition of metal nodes and the organic linkers in MOF materials allows for excellent functional expansion and regulation.…”