Amine-substituent induced highly selective and rapid “turn-on” detection of carcinogenic 1,4-dioxane from purely aqueous and vapour phase with novel post-synthetically modified d¹⁰-MOFs

Abstract

Herein, an amine decorated Cd(II) metal-organic framework (MOF) with uninodal 6-c topology was synthesized as a suitable platform for facile post-synthetic modification (PSM). The as-synthesized parent d10-MOF (1) with free...

A Ni-MOF as Fluorescent/Electrochemical Dual Probe for Ultrasensitive Detection of Picric Acid from Aqueous Media

“…After validation of the structural architecture, thermal and chemical stability of the Ni-OBA-Bpy-18 MOF, detailed photophysical characteristics were investigated. Conciliated by unified n−π* and π–π* transitions in the linkers, the Ni-OBA-Bpy-18 MOF/ACN dispersion exhibited the highest absorption band (λ max ) at 265 nm (Figure S11), wherein respective red shifts of ∼15 and ∼8 nm from the absorption bands of linkers confirmed firm covalent ligation of the metal node with struts (Figures S11, S12). Upon excitation at 265 nm, a sharp emission band at ∼435 nm was observed (Figures S11b, S13), featuring blue emission under UV light (see the CIE diagram, Figure S14), driven by a mixed impact of intra-ligand charge transfer, considerable internal π–π weak interaction, and ligand-to-ligand (π–π* and n−π*) charge transfer between π-electron rich benzene and pyridine rings of the struts, along with the influence of the metal center .…”

“…The solution-phase ppb level TNP detection phenomenon of the Ni-OBA-Bpy-18 MOF was extended to vapor phase sensing via adaptation of a previously reported experimental setup (see Figure S32), as described in the previous literature. , The schematic and pictorial representations of the adapted set-up are provided in the Supporting Information (Figure S32). As shown in Figure S33, the inherent fluorescence profile of the Ni-OBA-Bpy-18 MOF was quenched (∼35%) upon steady exposure of TNP vapor up to ∼24 min (time interval: ∼46 s), wherein maximum quenching occurred within ∼480 s, inferring rapid and excellent sensitivity of the sensory probe.…”

Recent progress of metal–organic frameworks as sensors in (bio)analytical fields: towards real-world applications

“…to subsequently (and by taking into consideration available linkers and suitable metals) to perform computational calculations ought to give trial MOFs structure, as digital ideal prototypes [ 103 ]. Once selected and prepared the MOF, computational tools are also highly useful to understand the mechanism of interactions in order to optimize the synthetic parameters [ 104 , 105 ]. For example, it was possible to evaluate the best sensing performances among nine different MOFs for the detection of gases by a Kullback-Liebler divergence study [ 106 ].…”

Engineering of metal–organic frameworks (MOFs) for thermometry

“…[9][10][11][12][13][14][15] MOFs are porous materials that are assembled from the connection between a metal ion (metal node or SBU) and an organic ligand. MOFs possess several crucial structural features, such as a regular organic-inorganic network, 16,17 high crystallinity, 18 porosity, 19,20 flexibility, 21,22 stability, 23 hostguest interaction capability 24 and easy functionalization 25 with tuneable pore size. 26 These features make them amenable to numerous potential applications, including sensing, [27][28][29][30] catalysis, 31,32 gas adsorption and sequestration, [33][34][35] separation, 36 and bio-application.…”