AI Article Synopsis
- The study focuses on an 8-fold interpenetrated diamondoid metal-organic framework (MOF) called X-dia-2-Cd, which is created using a new linker ligand and exhibits interesting sorption properties.
- X-dia-2-Cd undergoes reversible transformations between four different phases when exposed to various conditions, such as water and CO, while maintaining its space group.
- The framework shows significant thermal and hydrolytic stability, retaining its sorption capacity even after extensive cycling, making it promising for applications in gas storage and separation.
Article Abstract
In this work, we report the synthesis, structural characterisation and sorption properties of an 8-fold interpenetrated diamondoid (dia) metal-organic framework (MOF) that is sustained by a new extended linker ligand, [Cd(Imibz)], X-dia-2-Cd, HImibz or 2 = 4-((4-(1-imidazol-1-yl)phenylimino)methyl)benzoic acid. X-dia-2-Cd was found to exhibit reversible single-crystal-to-single-crystal (SC-SC) transformations between four distinct phases: an as-synthesised (from ,-dimethylformamide) wide-pore phase, X-dia-2-Cd-α; a narrow-pore phase, X-dia-2-Cd-β, formed upon exposure to water; a narrow-pore phase obtained by activation, X-dia-2-Cd-γ; a medium-pore CO-loaded phase X-dia-2-Cd-δ. While the space group remained constant in the four phases, the cell volumes and calculated void space ranged from 4988.7 Å and 47% (X-dia-2-Cd-α), respectively, to 3200.8 Å and 9.1% (X-dia-2-Cd-γ), respectively. X-dia-2-Cd-γ also exhibited a water vapour-induced structural transformation to the water-loaded X-dia-2-Cd-β phase, resulting in an S-shaped sorption isotherm. The inflection point occurred at 18% RH with negligible hysteresis on the desorption profile. Water vapour temperature-humidity swing cycling (60% RH, 300 K to 0% RH, 333 K) indicated hydrolytic stability of X-dia-2-Cd and working capacity was retained after 128 cycles of sorbent regeneration. CO (at 195 K) was also observed to induce a structural transformation in X-dia-2-Cd-γ and PXRD studies at 1 bar of CO, 195 K revealed the formation of X-dia-2-Cd-δ, which exhibited 31% larger unit cell volume than X-dia-2-Cd-γ.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10153660 | PMC |
| http://dx.doi.org/10.1039/d3ta01574b | DOI Listing |
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