A microporous lanthanum metal–organic framework as a bi-functional chemosensor for the detection of picric acid and Fe³⁺ ions

Abstract

A microporous lanthanum metal-organic framework [La(TPT)(DMSO)2]·H2O (La-MOF ()), has been synthesized using a rigid unsymmetrical tricarboxylate ligand of p-terphenyl-3,4'',5-tricarboxylic acid (H3TPT). The structure of is constructed by bi-nuclear lanthanum clusters and fully deprotonated TPT(3-) ligands, which can be simplified into a 3,6-connected flu-3,6-C2/c topology with a point symbol of (4(4)·6)2(4·6(2)·8(7)·10(2)). The π-electron rich ligand H3TPT enables to have blue luminescence when excited at 342 nm at ambient temperature. Meanwhile, exhibits the selective detection of picric acid (PA) and Fe(3+) ions in ethanol solution over other nitroaromatic compounds and metal ions. The high quenching efficiency and selectivity of makes it a potential bi-functional chemosensor for both PA and Fe(3+) ions.

Fluorene‐based Lanthanide Coordination Polymer: Structure, Luminescence and Sensing of Picric Acid

“…So the quenching effect on luminescence have no connection with the collapse of framework. According to previous literature, electron transfer, Förster resonance energy transfer (FRET) and competitive absorption may cause fluorescence quenching. Firstly, we analyze the UV–vis spectra of all nitro explosives collected by our group already, showing that the adsorption band of PA is wide in the range from 325 nm to 475 nm.…”

Stable Hydrazone-Linked Covalent Organic Frameworks Containing O,N,O′-Chelating Sites for Fe(III) Detection in Water

“…28 The detection and quantification of Fe(III) ion are extremely essential for living organisms since either the deficiency or overload of Fe(III) ion can result in many physiological disorders. 29 Consequently, the development of new luminescent framework materials that can be used for effective detection of Fe(III) is of great significance. In recent years, extensive efforts have been dedicated to the design and construction of functional luminescent MOF-based materials for detecting Fe(III) ion.19,20 Particularly, MOF structures that contain potential Lewis base sites have been realized to detect Fe(III) ion with enhanced sensing ability.30,31 On the contrary, fluorescent COF-based chemsensors bearing functional chelating sites for the detection of Fe(III) is extremely scarce, and undoubtedly highly desired.…”

Selective and Recyclable Sensing of Aqueous Phase 2,4,6-Trinitrophenol (TNP) Based on Cd(II) Coordination Polymer with Zwitterionic Ligand

“…, where Io and I are the luminescence intensities in the absence and in the presence of the TNP, respectively; Ksv is the quenching constant, and [M] is the molar concentration of TNP [38,39]. Interestingly, the SV plots were nearly linear at low concentration (R 2 = 0.9919), but a slight non-linear feature was produced at a higher concentration (Figure 4c, inset).…”