Tetraphenylethylene Immobilized Metal–Organic Frameworks: Highly Sensitive Fluorescent Sensor for the Detection of Cr₂O₇^2– and Nitroaromatic Explosives

Abstract

From the perspective of the chromophore, 1,1,2,2-tetrakis­(4-(pyridin-4-yl)­phenyl)­ethane (TPPE) with the π-electron-rich tetraphenylethylene (TPE) and aggregation induced emission feature is selected as functional ligand to construct the fluorescent metal–organic frameworks. Three luminescent MOFs (1–3) have been successfully synthesized. Through combining 4,4′,4″-nitrilotrisbenzoic acid (H3TNB) with electron-donor triphenylamine (TPA), the highly porous pillared-layer compound 1 [Zn3(TPPE)1/2(TNB)2]­(4DMA·7H2O) was synthesized; interestingly, this MOF sensor film realizes the fast detection for nitrobenzene compounds with a response time of less than 3 min as well as good recyclability. Compound 2 [Zn7(TPPE)2(SO4 2–)7]­(DMF·H2O) exhibits the clear “turn-off” quenching responses for Cr2O7 2– in aqueous phase with high selectivity and sensitivity. Meanwhile, the fluorescent properties of compound 3 [Zn2(TPPE)3/2(NO3 –)­(OH–)­(H2O)]­(DMF·2H2O) were also investigated. Thus, these MOF materials could serve as the promising platform for luminescent sensing.

Retracted: Luminescent In(III)‐based coordination polymer for selectively sensing Cr2O72−, antibacterial and anti‐inflammatory effect on the infectious abortion

“…After calculation, the K SV slope is 6555070 M –1 , which is 565 times more than that of dimethyl sulfoxide/functional fluorescent aramid fiber (11600 M –1 ) utilized for Cr 2 O 7 2– sensing in water while 95 times more than that of fluorescent carbon dot (69000 M –1 ) utilized to identify Cr 2 O 7 2– in water. K SV is also better than a number of other benchmark sensors based on MOF and Eu 3+ @MIL‐124 (60340 M –1 ) utilized for sensing Cr 2 O 7 2– in the water . Compound 1 is highly sensitive along with selective for Cr 2 O 7 2– detection within the solution of water.…”

3D Enantiomorphic Mg‐Based Metal–Organic Frameworks as Chemical Sensor of Nitrobenzene and Efficient Catalyst for CO2 Cycloaddition

“…The quenching of fluorescent emission for different nitro explosives follows the order:N B> 2-NP > 1,3-DNB > 4-NP > 2,4-DNT > 4-NA > 2-NT.S uch notable phenomenon could be ascribed to the unique nature of the metal-organicf ramework materials. [23] The framework of 1 with p-electron systems creates the electron-richm icroenvironment, which could enhance the charge transfer effect and orbital overlap between p-electron-rich donor and electron-deficient acceptornitroaromatics. [24] The above results indicate that compound 1h as high quenching efficiencies towardN B, but other nitro explosives also exhibit quenching behaviour.M otivated by these results, we furtheri nvestigated the anti-interferencea bility of 1 toward NB in presence of different analytes.…”

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

“…To construct luminescent CPs, several factors must be taken into account, such as suitable structure, well‐defined topologies, coordination environments of the metal centers and choice of organic ligands . Generally, ligands which possess π‐electron‐rich aromatic moieties can enhance fluorescence intensity of CPs . For example, Ye et al .…”