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Water vapour sorption properties of a family of square lattice topology porous coordination networks
Date
2025-07-24
Abstract
Porous coordination networks (PCNs) such as metal–organic frameworks are of topical interest thanks to their potential utility as sorbents for gas and vapour separations and/or storage. Interpenetrated PCNs, some of which offer promise for gas separations, remain relatively understudied in the context of water vapour sorption. Herein, we report an in-depth study of the water vapour sorption properties of a family of square lattice topology (sql) PCNs of general formula sql-[bipy,squa]-M-aqua (sql-M-aqua, M = Mn, Co, Ni, Zn, bipy = 4,4-bipyridine, squa = squarate). This family, several of which have been previously reported (Co, Ni, Mn), exist as rectangular grids that exhibit 2-fold inclined interpenetration, thereby forming ultramicroporous 3D supramolecular networks. Water vapour sorption studies of sql-M-aqua (M = Mn, Co, Ni, Zn) revealed S-shaped water vapour sorption isotherms with steps consistently below 10% relative humidity (RH) and little hysteresis. Such properties are pertinent to atmospheric water harvesting in arid regions (<30% RH). Water vapour humidity swing experiments (0–30% RH, 300 K) indicated hydrolytic stability for sql-M-aqua (M = Mn, Co, Ni, Zn) and retention of working capacity over 100 sorption/ desorption cycles. sql-M-aqua (M = Mn, Co, Ni, Zn) also exhibit CO2/N2 selectivity
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Description
Publisher
The Royal Society of Chemistry
Citation
CrystEngComm 27, pp. 5669-5675
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Shabangu_2025_Water.pdf
Adobe PDF, 1.16 MB
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Funding Information
Sustainable Development Goals
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Attribution-NonCommercial-ShareAlike 4.0 International