Postsynthetic Metalation Metal–Organic Framework as a Fluorescent Probe for the Ultrasensitive and Reversible Detection of PO₄^3– Ions

Abstract

The self-assembly of a zinc salt with the novel ligand 4,4',4″-[(1,3,5-triazine-2,4,6-triyl)tris(sulfanediyl)]tribenzoic acid generated 3D microporous metal-organic frameworks (MOFs), namely, {[Zn(L)(O)(HO)]·4EtOH} . The frameworks with multiple Lewis basic sites exhibit easily sensitized properties. After encapsulation of the Tb cation in this Zn-MOF, the as-obtained fluorescent-functionalized Tb@Zn-MOFs not only maintain distinguished chemical stabilities but also exhibit strong characteristic emissions of trivalent terbium ions. Interestingly, Tb@Zn-MOF has been chosen to be a potential highly selective and sensitive luminescent platform for the reversible detection of PO ions in aqueous and living cell buffer solutions with a fast response time of 10 s and a low detection limit (0.1 ppm). Strikingly, this work presents the first example of a fluorescent sensor that can quantitate PO in simulated biological fluids and monitor these ions in the water system in a wide range of concentrations from 10 to 10 M.

Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2

“…In addition, the corresponding binding energy data for Tb was displayed in Figure 5b. The peaks at around 1240.9 eV and 1274.7 eV indicate the binding energy of Tb 3d 5/2 and 3d 3/2 [53]. On the basis of above analysis, the peaks corresponding to Tb confirmed the successful incorporation of Tb-(PMDA-Si)-ClO 4 and Tb-(PMDA-Si)-phen-ClO 4 complexes onto the surface of SiO 2 .…”

Highly Selective and Sensitive Detection of PO43– Ions in Aqueous Solution by a Luminescent Terbium Metal–Organic Framework

“…Besides, excessive phosphate and its derivatives can also affect the absorption of calcium ions in the human bodies and cause irreversible harm to people’s life. 24−26 As a pollutant anion, PO 4 3– possesses less binding reactive sites and lower reactivity, so detection of PO 4 3– emerges a major challenge in the field of chemosensors. 27−29…”

Zinc(ii)-based coordination polymer encapsulated Tb3+ as a multi-responsive luminescent sensor for Ru3+, Fe3+, CrO42−, Cr2O72− and MnO4−

“…19,20,23,24 Recently, lanthanide ions were doped into CPs by post-synthesis method (PSM), and an alternative strategy to construct Ln-CPs and optimize photoluminescence was proposed. 25,26 Any desired uorescent probe can be obtained by changing the molar ratio of reactants. 27,28 Some luminescent CPs have been developed in recent years to effectively simultaneously sense Fe 3+ and Cr 2 O 7…”