Ultra-micropores are typically made of small rigid ligands and hence exhibit significant inflexibility. This has made them find a special place in gas-separation and storage. Stepping out of this realm, via a 'by design' approach, we have managed to introduce flexibility into these otherwise rigid frameworks using the concept of “Hard-Soft Gate Control (HSGC)” or via the aid of flexible ligand. This chemically tuned flexibility gives rise to 'molecular sponge' behavior to these MOFs. We have exploited this flexibility to gain guest-specific adsorption in them. The MOF sponge enables the selective removal and speciation of undesired Fe3+ in the presence of Fe2+, a biologically important species. Interestingly, it is completely recylcable and the entire capture and release can be monitored by the in-built turn-off/turn-on luminescnece in the MOF.

Flexible ultra-microporous MOFs in play

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.