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Aliphatic Ligand Design Principles for Rigid Pore-Space-Partitioned Metal-Organic Frameworks for Gas Separation.

Wei Wang1, Khai X Phan2, Ziyang Jia1

  • 1Department of Chemistry, University of California, Riverside, 900 University Ave, Riverside, CA, 92521, USA.

Angewandte Chemie (International Ed. in English)
|January 19, 2026
PubMed
Summary
This summary is machine-generated.

We developed a new strategy to rigidify flexible aliphatic ligands for advanced framework materials. This approach enhances pore geometry and gas separation capabilities, particularly for ethane/ethylene mixtures.

Keywords:
Bicyclohexanedicarboxylic acidExpanded bioisosteric replacementGas separationLigand rigidification and expansionPore space partition

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Aliphatic ligands in framework materials often suffer from flexibility issues, leading to poor crystallization, low porosity, and instability.
  • Existing methods to improve porosity, like ligand elongation, can exacerbate these problems.
  • Rigidity in ligands is typically achieved through π-conjugation, limiting design options.

Purpose of the Study:

  • To introduce an expanded bioisosteric replacement (eBIS) concept for scaling up and rigidifying aliphatic ligands.
  • To demonstrate a novel ligand design that overcomes the limitations of flexible aliphatic linkers in framework materials.
  • To explore new metal-cluster chemistry and enhance gas separation properties.

Main Methods:

  • Designed and synthesized a novel aliphatic ligand by linking two cyclohexyl rings in series.
  • Incorporated the ligand into metal-organic frameworks (MOFs) on the pacs platform.
  • Characterized the resulting MOFs for pore geometry, surface area, metal-cluster formation, and gas adsorption properties (ethane/ethylene).

Main Results:

  • The new ligand exhibits consistent rigidity across different MOF platforms due to intramolecular non-covalent interactions.
  • Achieved extreme pore geometry with the highest hexagonal c/a ratio and synthesized a novel nickel-titanium oxocluster.
  • The MOF demonstrated a high BET surface area (2810 m² g⁻¹) and significant ethane/ethylene uptake differences (88 cm³ g⁻¹, 1.83 ratio at 273 K), along with low adsorption enthalpies for efficient regeneration.

Conclusions:

  • The eBIS concept effectively rigidifies aliphatic ligands, enabling the design of high-performance framework materials.
  • The developed MOF shows promise for selective ethane separation and low-energy regeneration.
  • This work opens new avenues for utilizing aliphatic ligands in MOF design and applications.