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Two 2D Microporous MOFs based on Bent Carboxylates and Linear Spacer for Selective CO2 Adsorption

Abstract

Two new 2D MOFs, formulated as {[Cd(OBA)(L)].DMF}n, 1 and {[Zn2(SDB)2(L)].EtOH.3H2O.2DMF}n, 2 (L = 3-pyridinecarboxaldehyde nicotinoylhydrazone, H2OBA = 4, 4´-oxybis(benzoic acid), H2SDB = 4, 4´-sulfonyldibenzoic acid, DMF = N, N-dimethylformamide), have been synthesized at room temperature and characterized by elemental analyses (EA), FTIR spectra, single-crystal X-ray diffraction analyses (SCXRD), powder X-ray diffraction analyses (PXRD) and thermogravimetric analyses (TGA). The structural investigations reveal that both the MOFs can be rationalized as a 4-c, uninodal net with sql topology. 1 and 2 are permanently microporous having 1D channels of approximate size of 3.6 x 4.2 Å2 and 6.6 x 8.0 Å2 respectively. Furthermore, CO2, CH4 and N2 sorption studies were carried out in detail at varying temperature and the results showed that the adsorption capacity of both 1 and 2 towards CO2 is higher than CH4 and N2. Importantly, IAST calculation reveals that 1 and 2 display high separation selectivity for CO2/N2 (15:85) and CO2/CH4 (50:50) mixture at ambient conditions.

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Publication details

The article was received on 10 Nov 2018, accepted on 02 Dec 2018 and first published on 03 Dec 2018


Article type: Paper
DOI: 10.1039/C8CE01925H
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Two 2D Microporous MOFs based on Bent Carboxylates and Linear Spacer for Selective CO2 Adsorption

    A. Pal, A. Mitra, S. Chand, J. Lin and M. C. Das, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01925H

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