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Reticular chemistry for the rational design of mechanically robust mesoporous merged-net metal-organic frameworks

Journal Article · · Matter (Online)
 [1];  [2];  [1];  [3];  [1];  [1];  [1];  [4];  [1];  [3];  [2];  [1]
  1. King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  2. École Polytechnique Fédérale de Lausanne (EPFL), Valais (Switzerland)
  3. King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia); Politecnico di Torino (Italy)
  4. King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia); King Faisal University (KFU) (Saudi Arabia)

Access to metal-organic frameworks (MOFs) with enhanced mechanical stability is key to their successful deployment in practical applications. However, the high porosity of the material often affects mechanical stability. In this article, to achieve highly porous MOFs with enhanced mechanical stability, we explored the merged-net approach where two relatively fragile frameworks were merged into a robust MOF structure. We demonstrate the effectiveness of this approach by computationally evaluating mechanical properties of sph-MOFs with varying lengths of linkers. Prominently, we pinpoint the significance of triangular rigidity on the robustness of large-pore MOFs and, subsequently, designed and synthesized a rare earth (RE)-based RE-sph-MOF-5 by the reticulation of hexanuclear RE clusters, tritopic linkers, and unprecedentedly large planar hexatopic linkers containing 19 phenyl rings. The mechanical properties of sph-MOFs were characterized and quantified using amplitude-frequency modulation (AM-FM) bimodal atomic force microscopy (AFM) analyses. Markedly, the mesoporous RE-sph-MOF-5 expresses high mechanical stability despite its large mesoporous cavities.

Research Organization:
King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
Sponsoring Organization:
USDOE
OSTI ID:
2424586
Journal Information:
Matter (Online), Journal Name: Matter (Online) Journal Issue: 1 Vol. 6; ISSN 2590-2385
Publisher:
Cell Press/ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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