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Article 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 () PCNs of general formula (, 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 (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 (M = Mn, Co, Ni, Zn) and retention of working capacity over 100 sorption/desorption cycles. (M = Mn, Co, Ni, Zn) also exhibit CO/N selectivity.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12319667 | PMC |
| http://dx.doi.org/10.1039/d5ce00385g | DOI Listing |
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