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- Title
Preventing Undesirable Structure Flexibility in Pyromellitate Metal Organic Frameworks.
- Authors
Hayes, Oliver G.; Warrender, Stewart J.; Cordes, David B.; Duncan, Morven J.; Slawin, Alexandra M. Z.; Morris, Russell E.
- Abstract
Removal of coordinated water molecules from the porous Zn‐pyromellitate metal organic framework Zn5(OH)2(PMA)2(H2O)4·xH2O (PMA = pyromellitic acid or 1,2,4,5‐benzene tetracarboxylic acid) should generate coordinatively unsaturated metal sites suitable for gas adsorption. However, reports of instability towards dehydration have restricted the study and utility of this MOF. Here we examine in more detail the nature of the structural transformation that occurs upon dehydration. This study reveals that a fully reversible crystalline‐crystalline transformation from a porous to a non‐porous homologue takes place, proceeding through a partially dehydrated intermediate. We show that doping the structure with Ni2+ ions at greater than 30 % prevents structural rearrangement, thereby maintaining porosity, and rendering the material effective for gas (nitric oxide) adsorption applications. These results indicate that doping can be an effective means to increase the utility of otherwise unserviceable structures.
- Subjects
METAL-organic frameworks; GAS absorption &; adsorption; POROUS metals; NITRIC oxide; IONIC structure; POROSITY
- Publication
European Journal of Inorganic Chemistry, 2020, Vol 2020, Issue 26, p2537
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.202000322