The solvothermal reaction of ZrCl4 with benzo[1,2-b:4,5-b’]dithiophene-2,6-dicarboxylic acid linker molecule in presence of trifluoro acetic acid modulator afforded the UiO-66 type of metal organic framework (MOF) (IITG-5, IITG = Indian...

A new metal-organic-framework (MOF) called UiO-66-NH-COCF3 was prepared using trifluoroacetamido functionalized terephthalic acid ligand. Powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, thermogravimetric analysis (TGA) and Brunauer Emmett-Teller (BET) experiment were...

Here, we report a metal–organic framework (MOF) [Hf6O4(OH)4(TFNDC)6]·6H2O·2DMF [SHMOF, where TFNDC = 1-(2,2,2-trifluoroacetamido)­naphthalene-3,7-dicarboxylate], which possesses excellent chemical and thermal stability along with remarkable hydrophobic characteristics. The hydrophobic SHMOF was used for in situ coating on the polypropylene (PP) fabric to make a superhydrophobic SHMOF–PP fabric composite. The immobilization of nanocrystalline particles of SHMOF creates a nanoscale hierarchy that enhances the hydrophobicity of the material. The superhydrophobic SHMOF–PP composite showed a water contact angle of 160°. The successful integration of the MOF compound with PP fabric was confirmed using field-emission scanning electron microscopy, X-ray powder diffraction spectroscopy, Fourier transform infrared spectroscopy, and energy-dispersive X-ray analysis experiments. Superhydrophobic SHMOF–PP composite displayed a high separation efficiency (93–99%) for separating light, heavy, and crude oils from oil–water mixtures. The flux for oil–water separation was found to be 13–18k L m–2 h–1. Importantly, the SHMOF–PP composite can be used repetitively up to a minimum of 20 times for oil–water separation. The recyclability was also maintained in high acidic and alkaline media. Moreover, superhydrophobic SHMOF–PP composite showed excellent oil absorption capacity (29–39 g/g) for heavy and light oils at ambient temperature. A gravity-driven active-filtration process and separation against the gravity process were also performed to examine the flexibility of the composite for separation. We demonstrate that the SHMOF–PP composite has the merit of very high separation efficiency, absorption capacity, good recyclability, and exceptional robustness, showing high potential for versatile oil–water separation. Additionally, the material displayed noticeable self-cleaning and antifouling properties. The SHMOF–PP composite also exhibited good efficiency (95–99%) and flux density (1845–1899 L m–2 h–1) for the separation of water-in-oil emulsions.

A hydrophobic MOF (1′@CF3) was synthesized by post-synthetic modification to anchor -CF3 group to the Zr- BDC-OH MOF (1′). The hydrophobic property of the MOF was used for the preparation...

A new MOF named Al‐CAU‐10‐OC3H5 is presented (MOF=metal‐organic framework, CAU=Christian‐Albrechts‐University). The material (1) was prepared by incorporating an allyloxy functionalized 5‐(allyloxy)isophthalic acid (H2AIA) as a linker via a traditional solvothermal procedure. Various analytical tools such as FT‐IR, PXRD, thermogravimetric and N2 physisorption analyses were utilized to characterize the material. Material 1 is stable up to 350 °C in argon environment. It also showed good stability of its framework in acetic acid, 1 (M) HCl, water, methanol, ethanol and acetone. The activated form of material 1 (named 1′) displayed sensitive recognition of Pd(II) ion having great specificity in water through “turn‐off” fluorescence signal. When the potentially competitive analytes were present, the probe can also recognize Pd2+ ion selectively. The values of Stern‐Volmer constant (1.05×105 M−1) and detection limit (26.24 ppb) prove the remarkable sensing ability of this probe. Furthermore, from the PXRD study after Pd2+ sensing, it was observed that the peak position and crystallinity of the MOF were very similar with the activated MOF which suggest the maintenance of structural integrity during the sensing experiment. Hence, the probe is highly effective for the sensing of Pd2+. In addition, the sensing mechanism has been investigated comprehensively.

A zirconium-MOF with sulphonic acid functionalized biphenyldicarboxylic acid linker was synthesized by a solvothermal process. The material was characterized by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), Brunauer Emmett-Teller (BET),...

A new ultrasensitive and ultrafast Al(III) metal−organicframework (MOF)-based probe (1) was constructed to detect Pd 2+ ions. Extremely selective recognition of Pd 2+ ion was demonstrated by the guest-free compound 1 (called 1′) using a fluorescence signal. The quenching in the fluorescence signal was observed due to the weak interaction between the linker alkyne−π bond and Pd 2+ . The mechanism of isophthalic alkyne−π and Pd 2+ interaction was systematically examined with the help of isothermal titration calorimetry (ITC), Xray photoelectron spectroscopy (XPS), and UV−vis spectroscopy. The response time of the MOF for sensing of Pd 2+ was 30 s, which is the lowest response time for MOF-based Pd 2+ sensing to date, with an ultralow detection limit (102 nM) and Stern−Volmer constant (4.39 × 10 3 M −1 ), evidencing the outstanding ability to sense Pd 2+ ion by this probe. The Pd 2+ detection limit falls among the lowest values. Activated MOF (1′) also showed considerable recyclability up to five steps with a constant sensing ability. In different water resources (Milli-Q water, lake water, river water, and tap water), the probe also showed excellent sensing ability. A paper-strip device was developed for the applicability of our material for the real field sensing application of Pd 2+ . The relevance of 1′ is not only up to Pd 2+ , but it could also sense palladium in other possible oxidation states.

No abstract