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Issue 3, 2019
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Two 2D microporous MOFs based on bent carboxylates and a linear spacer for selective CO2 adsorption

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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 MOFs can be rationalized as a 4-c, uninodal net with sql topology. 1 and 2 are permanently microporous, having 1D channels with approximate sizes of 3.6 × 4.2 Å2 and 6.6 × 8.0 Å2, respectively. Furthermore, CO2, CH4 and N2 sorption studies are carried out in detail at varying temperatures, and the results show that the adsorption capacities of both 1 and 2 towards CO2 are higher than those towards CH4 and N2. Importantly, IAST calculations reveal that 1 and 2 display high separation selectivities for CO2/N2 (15 : 85) and CO2/CH4 (50 : 50) mixtures at ambient conditions.

Graphical abstract: Two 2D microporous MOFs based on bent carboxylates and a linear spacer for selective CO2 adsorption

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Supplementary files

Article information


Submitted
10 Nov 2018
Accepted
02 Dec 2018
First published
03 Dec 2018

CrystEngComm, 2019,21, 535-543
Article type
Paper

Two 2D microporous MOFs based on bent carboxylates and a linear spacer for selective CO2 adsorption

A. Pal, A. Mitra, S. Chand, J. Lin and M. C. Das, CrystEngComm, 2019, 21, 535
DOI: 10.1039/C8CE01925H

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