Controlling the Flexibility of MIL-88A(Sc) Through Synthetic Optimisation and Postsynthetic Halogenation |
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Authors: | Catherine A Walshe Dr Alexander J R Thom Dr Claire Wilson Dr Sanliang Ling Prof Ross S Forgan |
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Institution: | 1. WestCHEM School of Chemistry, University of Glasgow Joseph Black Building, University Avenue, Glasgow, G12 8QQ UK;2. Advanced Materials Research Group, Faculty of Engineering, University of Nottingham University Park, Nottingham, NG7 2RD UK |
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Abstract: | Breathing behaviour in metal-organic frameworks (MOFs), the distinctive transformation between a porous phase and a less (or non) porous phase, often controls the uptake of guest molecules, endowing flexible MOFs with highly selective gas adsorptive properties. In highly flexible topologies, breathing can be tuned by linker modification, which is typically achieved pre-synthetically using functionalised linkers. Herein, it was shown that MIL-88A(Sc) exhibits the characteristic flexibility of its topology, which can be tuned by 1) modifying synthetic conditions to yield a formate-buttressed analogue that is rigid and porous; and 2) postsynthetic bromination across the alkene functionality of the fumarate ligand, generating a product that is rigid but non-porous. In addition to providing different methodologies for tuning the flexibility and breathing behaviour of this archetypal MOF, it was shown that bromination of the formate-bridged analogue results in an identical material, representing a rare example of two different MOFs being postsynthetically converted to the same end product. |
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Keywords: | breathing chemisorption flexible metal-organic frameworks postsynthetic modification |
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