Monodentate AIEgen Anchored on Metal‐Organic Framework for Fast Fluorescence Sensing of Phosphate

Abstract

Metal-organic frameworks | Fluorescent probes | Phosphate | Monodentate ligand | AIEgen Herein, a novel sensor (TPE-UiO-66) was designed via anchoring monodentate tetraphenylethylene (TPE) onto UiO-66 framework. The combination of the distinct aggregation-induced emission (AIE) of TPE and the easy replacement of monodentate linker by guest phosphate, makes TPE-UiO-66 an ideal platform for sensing HPO 4 2-. Experimental results indicate that TPE-UiO-66 can selectively sense HPO 4 2from other common anions. The limit of detection (LOD) can reach to 5.56 μmol•L-1 and more importantly, TPE-UiO-66 also exhibits an ultra-fast equilibrium response of 2 min, far faster than those of other sensors especially for UiO-66-NH 2. The combination of experimental analysis and density functional theory (DFT) calculations demonstrates that the high selectivity, high sensitivity and fast response of HPO 4 2detection by TPE-UiO-66 can be attributed to the stronger coordination interactions of HPO 4 2with Zr-O cluster of UiO-66 than that of TPE molecule. This study not only provides a potential probe for phosphate, but also represents a novel strategy to design stimuli-responsive fluorescent MOF-based sensors via using monodentate AIEgens.

Hydrolytically Stable Zr-Based Metal–Organic Framework as a Highly Sensitive and Selective Luminescent Sensor of Radionuclides

“…As a new class of hybrid materials assembled from metal nodes and organic linkers, metal–organic frameworks (MOFs) are scientifically compelling in gas storage, separation, sensing, catalysis, and so forth. − Their tunability in terms of chemical composition and structure renders MOFs as promising candidate materials for radionuclide sensing. − Incorporating photoluminescent (PL) metal centers or organic phosphors within the frameworks endows sensing capacities of MOFs toward the target radionuclides via emission alteration of the host. , Furthermore, phosphors can be orderly and spatially distributed in rigid luminescent MOFs, eliminating luminescence quenching induced by agglomeration and boosting the detection sensitivity. , In addition, the feasible in-and-out channels and tailorable binding site of MOFs allow for sensing of target radionuclides with high selectivity. , However, only a few MOFs for sensing of UO 2 2+ have been documented. − Those for detection of the I – anion have been barely reported, and the most relevant cases thus far include Ln 2 Zn­(L) 3 (H 2 O) 4 ]­(NO 3 ) 2 (Ln = Eu or Tb), [Eu 4 (OH) 4 (tcbpp) 2 (H 2 O) 9 ]­Cl 8 , Cd 2.5 (PDA)­(tz) 3 , and Tb­(cpia)­(H 2 O) 2 . − Moreover, the hydrolytic stability, a key parameter of the chemosensor for practical applications under environmentally relevant conditions, was not investigated in most studies. − …”

Inorganic‐Based Aggregation‐Induced Luminescent Materials: Recent Advances and Perspectives

“…Gao et al prepared TPE‐UIO‐66 by anchoring single‐dentate TPE ligand (TPE‐COOH) on UiO‐66 framework. [ 143 ] Since HPO 4 2− has a higher affinity for Zr than TPE‐COOH, it is able to exchange AIEgens ligands to form P–O–Zr coordination bonds. TPE‐COOH replaced by HPO 4 2− dissolved and turned off the fluorescence of TPE‐UiO‐66.…”

Zinc(ii) Schiff base complexes as dual probes for the detection of NH4+ and HPO42− ions

“…In NH 4 + and HPO 4 2− ion fluorescence detection, the Lu 36 group developed a Zn-MOF material for the simple and rapid detection of NH 4 + in water with a low LOD in the range of 0–3 mM, the Kavallieratos 37 group based on 1,3,5-triethylbenzene material synthesized a NH 4 + fluorescence sensor with remarkable sensing selectivity. The Zhao 38 group designed a novel sensor via anchoring monodentate tetraphenylethylene (TPE) onto a UiO-66 framework, which can selectively sense HPO 4 2− from other common anions. The Li 39 group uses a nano-fluorescence sensor to monitor HPO 4 2− and has practical applications in environmental water samples or cell imaging.…”