Browsing by Author "Goswami, Subhadip"

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    New Pillar-MOF with Nitrogen-Donor Sites for CO2 Adsorption
    (2024) Lancheros Sánchez, Andrés Fernando; Goswami, Subhadip; Zarate, Ximena; Blanco, Elodie; Schott Verdugo, Eduardo Enrique; Hupp, Joseph T.
    A new pillar-MOF [Zn2(L)(DABCO)] was solvo-thermally synthesized by using a new linker (L = 4,4′-(1,4-phenylenebis(3,5-dimethyl-1H-pyrazole-4,1-diyl))dibenzoic acid),Zn(NO3)2·6H2O, and triethylenediamine (DABCO) as pillarlinker. It was characterized using single-crystal X-ray diffraction,powder X-ray diffraction (PXRD), thermogravimetric analysis(TGA), and scanning electron microscopy (SEM) and tested forCO2 adsorption. It exhibits dinuclear paddle−wheel nodes wherethe Zn(II) cations are coordinated by four equatorial L linkersgenerating two-dimensional sheets. DABCO acted as a pillarbinding the sheets to obtain a neutral three-dimensional frameworkthat shows one-dimensional square channels. The new pillar-layered MOF presents micro- and mesopores, and its crystallinity is preserved after activation at 160 °C × 16 h and adsorption ofCO2. Due to the presence of the pyrazole nitrogen atoms in the framework, which have an increased affinity toward CO2, this newmaterial exhibited a reasonable CO2 uptake capacity and a low isosteric enthalpy of adsorption (Hads)
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    Nitrogen-enriched flexible metal-organic framework for CO2 adsorption
    (2024) Lancheros Sánchez, Andrés Fernando; Goswami, Subhadip; Zarate, Ximena; Schott Verdugo, Eduardo Enrique; Hupp, Joseph T.
    A novel MOF named [Zn-2(L)(DMF)] was synthesized using solvothermal methods from the reaction of the new linker (4,4 ',4 ''-(4,4 ',4 ''-(benzene-1,3,5-triyltris(methylene))tris(3,5-dimethyl-1H-pyrazole-4,1-diyl))tribenzoic acid) and Zn(NO3)(2)6H(2)O. This new MOF was characterized by means of different techniques: powder X-ray diffraction, N-2 adsorption and desorption isotherms, thermogravimetric analysis, and scanning electron microscopy. Furthermore, suitable crystals were obtained, which allowed us to perform the X-Ray structure determination of this MOF. The capability of these new MOF to adsorb CO2 at different temperatures was measured and its isosteric enthalpy of adsorption was calculated. The novel MOF shows an uncommon node composed of a Zn-3(-COO)(6)(DMF)(2), and the asymmetric unit contains one crystallographically independent linker, one DMF molecule, and two Zn atoms. The [Zn-2(L)(DMF)] MOF is a microporous material with high crystallinity and stability up to 250 degrees C. The multiple nitrogenated pyrazole linkers in its framework enhance its CO2 adsorption capabilities. This material exhibits a low CO2 isosteric enthalpy of adsorption (H-ads), comparable to previously reported values for similar nitrogenated materials. All the observed CO2 adsorption capacities were further supported by DFT calculations.