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Two d¹⁰ luminescent metal-organic frameworks as dual functional luminescent sensors for (Fe³⁺,Cu²⁺) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity.

ABSTRACT: Two luminescent 3D supramolecular structures [Cd₃(L)₂(2,2-bipy)₂](DMF)₃(CH₃CH₂OH)₂(H₂O) (1) and [Zn₃(L)₂(2,2-bipy)₂(DMF)₂](DMF)₂(CH₃CH₂OH)₂(H₂O) (2) (H₃L = 4,4',4''-nitrilotribenzoic acid) have been successfully synthesized under solvothermal conditions using Cd(NO₃)₂·4H₂O or Zn(NO₃)₂·6H₂O as the metal sources, and 4,4',4''-nitrilotribenzoic acid (H₃L), 2,2-bipy as the ligands in DMF solvent. Compound 1 displays a bi-nodal (2,3,6)-coordinated net with {8³}₂{8⁶·12⁶·16³}{8}₆ topology, compound 2 can be described as a (3,6)-connected 2-nodal net with kgd topology. The phase purity of compound 1 and 2 is characterized by X-ray powder diffraction (XRPD), thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. Compound 1 and 2 can serve as effective luminescent sensors for Fe³⁺, Cu²⁺ and TNP via luminescent quenching.

SUBMITTER: Zhou X

PROVIDER: S-EPMC9049058 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Two d10 luminescent metal-organic frameworks as dual functional luminescent sensors for (Fe3+,Cu2+) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity.

Zhou Xiaojing X Guo Xiaolei X Liu Lili L Zhai Haidong H Meng Qingguo Q Shi Zhan Z Tai Xishi X

RSC advances 20200129 8

Two luminescent 3D supramolecular structures [Cd3(L)2(2,2-bipy)2](DMF)3(CH3CH2OH)2(H2O) (1) and [Zn3(L)2(2,2-bipy)2(DMF)2](DMF)2(CH3CH2OH)2(H2O) (2) (H3L = 4,4',4''-nitrilotribenzoic acid) have been successfully synthesized under solvothermal conditions using Cd(NO3)2·4H2</s ...[more]

PMID: 35495274

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Project description:For a strategic incorporation of both π-electron-rich moieties and Lewis basic moieties acting as hydrogen bonding recognition sites in the same molecule, two new fluorescent sensors, N,N'-bis(anthracen-9-ylmethyl)-N,N'-bis(pyridin-2-ylmethyl)butane-1,4-diamine (banthbpbn, 1) and N,N'-bis(naphthalen-1-ylmethyl)-N,N'-bis(pyridin-2-ylmethyl)butane-1,4-diamine (bnaphbpbn, 2), have been developed for the selective detection of highly explosive 2,4,6-trinitrophenol (TNP) in water. Each of the two identical ends of these sensors that are linked with a flexible tetra-methylene spacer contains a mixed aromatic bicyclic fused ring (anthracene or naphthalene) and a pyridyl group. These are synthesized via the simple reduced Schiff base chemistry, followed by the nucleophilic substitution reaction under basic conditions in high yields. Both 1 and 2 were characterized by Fourier transform infrared, UV-vis, and NMR (1H and 13C) spectroscopy, and high-resolution mass spectrometry. The bulk phase purity of 1 and 2 and their stability in water were confirmed by powder X-ray diffraction (PXRD). Utilizing the effect of solvents on their emission spectra as determined by fluorescence spectroscopy, spectral responses for 1 and 2 toward various nitro explosives were recorded to determine a detection limit of 0.6 and 1.6 ppm, respectively, for TNP in water via the "turn-off" quenching response. Also, the detailed mechanistic investigation for their mode of action through spectral overlap, lifetime measurements, Stern-Volmer plots, and density functional theory calculations reveals that resonance energy transfer and photoinduced electron transfer processes, and electrostatic interactions are the key aspects for the turn-off response toward TNP by 1 and 2. In addition, the selectivity for TNP has been found to be more in 1 compared to 2. Both exhibit good recyclability and stability after sensing experiments, which is confirmed by PXRD and field-emission scanning electron microscopy.

Dataset Information

Two d¹⁰ luminescent metal-organic frameworks as dual functional luminescent sensors for (Fe³⁺,Cu²⁺) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity.

Publications

Two d<sup>10</sup> luminescent metal-organic frameworks as dual functional luminescent sensors for (Fe<sup>3+</sup>,Cu<sup>2+</sup>) and 2,4,6-trinitrophenol (TNP) with high selectivity and sensitivity.

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