George Mouchacham 66309Georges Mouchaham, Institute of Porous Materials of Paris (IMAP UMR 8004 CNRS-ENS-ESPCI)

 

I am Georges Mouchaham, CNRS researcher at the Institute of Porous Materials in Paris.

Our laboratory specializes in porous materials with fascinating properties, MOFs, for Metal Organic Frameworks, or porous hybrid solids. We were looking for a powerful characterization method to identify some very characteristic atoms such as oxygen. We contacted the NMR team at the Laboratory of Biomolecules (LBM) at ENS-PSL to study one of our mesoporous MOFs (MIP-206) by solid-state NMR amplified by DNP, as part of the IR infrastructure -RMN-THC, now Infranalytics. The first studies were very conclusive and led to a collaboration. These results have opened the door to other perspectives that we are trying to explore.

This NMR-DNP study made it possible for the first time to identify all the different types of oxygen atoms (organic and inorganic) present in a Zr-MOF, MIP-206, without any oxygen enrichment. -17. Oxygen-17 is an attractive target because it is very sensitive to its local environment but its natural abundance is extremely low (0,038%). In particular, we observed signals from µ2-O very specific to Zr type building brick12-oxo-cluster. This type of very advanced characterization, which makes it possible to reproduce a sort of mapping of oxygen atoms, will be very useful for the structural elucidation of new MOFs or other types of materials.
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Find out more: https://doi.org/10.1039/D0CP06064J 

Platform used: LMB, ENS, Paris