Post‐synthesis metal‐organic framework for turn‐on ratiometric fluorescence sensing of UO₂²⁺

Abstract

Uranium is an important and toxic radioactive nuclide, which is usually exist in nature water as uranyl ions. In this work, we developed a rapid sensitive and selective analytical methods for detection uranyl ions in aqueous solution. The Eu 3 + incorporated MOF through post-synthesis strategy was obtained, which exhibits excellent turn-on and ratiometric fluorescence sensing ability toward uranyl ions with the limit of detection as low as 3 nM. Moreover, this probe also shows great selectivity towards uranyl ions in the presence of a wide range of environmentally interfering species and good sensing capacity in real water samples. We also discussed the sensing mechanism combine the XPS results and calculations.

Near-Unity Energy Transfer from Uranyl to Europium in a Heterobimetallic Organic Framework with Record-Breaking Quantum Yield

“…These emitting levels are close to three transitions of Eu 3+ , 5 D 0 ← 7 F 0 (17,300 cm –1 ), 5 D 0 ← 7 F 1 (19,000 cm –1 ), and 5 D 1 → 7 F 1 (18,600 cm –1 ), tallying with the criterion for energy transfer. Meanwhile, it has been confirmed that the difference in the emissive energy level between UO 2 2+ and Eu 3+ enables efficient energy transfer from UO 2 2+ and Eu 3+ . − Therefore, it can be proposed that integrating UO 2 2+ into the EuMOF structure would greatly improve the PLQY of EuMOF due to the efficient energy transfer from UO 2 2+ and Eu 3+ (Scheme ). As a proof of concept, we synthesized a heterobimetallic uranyl europium organic framework as a paradigm to clarify the record-breaking PL property through the nearly 100% energy transfer efficiency from UO 2 2+ to Eu 3+ , achieving the highest PLQY among all documented EuMOFs.…”

A pH‐responsive Zr‐based metal organic framework PCN‐777 as a potential oral drug carrier

“…MOF is characterized by high porosity, large specific surface area and topological diversity [16–18] . As a result, MOF is usually applied to the fields of drug delivery, [19] electrocatalysis, [20] temperature sensors, [21] ion detection, [22,23] hydrogen storage, [24] dye absorption, [25] fluorescent sensors, [26] etc. Especially, MOF has been receiving more and more attention as drug carriers due to its high structural and functional designability.…”

Sulfur‐Doped Hydrogen‐Bonded Organic Framework for Improved Oxygen Evolution Reaction

“…Porous organic frameworks including metal-organic frameworks and covalent organic frameworks have shown considerable potential for catalysis, gas separation and sensing, by virtue of their powerful pore chemistry and tunable active sites. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Besides, hydrogen-bonded organic frameworks (HOFs) as a class of newly emerging materials, are constructed by supramolecular interactions such as hydrogen bonds, and gain increased attention in various fields. [24][25][26][27][28] However, to our knowledge, there have been few researches on using HOFs as OER electrocatalyst, mostly restricted by their lack of enough active sites.…”