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  3. Programming Heterofunctional Active Sites Via In Situ Reticular Editing Of Metal-macrocyclic Frameworks.
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  3. Programming Heterofunctional Active Sites Via In Situ Reticular Editing Of Metal-macrocyclic Frameworks.

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Programming Heterofunctional Active Sites via In Situ Reticular Editing of Metal-Macrocyclic Frameworks.

Junyu Ren1, Yanpei Song1, Yingxiang Ye2

  • 1Department of Chemistry, University of North Texas, Denton, Texas 76201, United States.

Journal of the American Chemical Society
|April 16, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed novel metal-macrocyclic frameworks (MMCFs) using tertiary amine-embedded cyclen-based ligands. This strategy enables cooperative binding sites for enhanced sulfur dioxide (SO2) capture, showcasing a new method for designing advanced porous materials.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Chemical Engineering

Background:

  • Traditional metal-organic frameworks (MOFs) rely on pre-functionalized ligands, limiting cooperative binding site construction due to synthetic complexity and steric hindrance.
  • Developing MOFs with tailored pore environments for specific applications like gas capture remains a significant challenge.

Purpose of the Study:

  • To design and synthesize novel tertiary amine-embedded cyclen-based ligands for constructing metal-macrocyclic frameworks (MMCFs).
  • To demonstrate the utility of a new strategy, in situ reticular editing (ISRE), for creating cooperative binding sites within the MOF matrix.
  • To evaluate the SO2 sorption performance of the synthesized MMCFs and elucidate the underlying mechanisms.

Main Methods:

  • Synthesis of tetratopic and T-shaped tritopic cyclen-based ligands.
  • Construction of three isostructural, highly porous Zr-MMCFs (MMCF-5, MMCF-7-AcOH, MMCF-7-AA).
  • SO2 sorption measurements, X-ray crystallography, density functional theory (DFT) calculations, and in situ DRIFT spectroscopy.

    • Main Results:

    • The tritopic ligand facilitated the framework as a reactive matrix via ISRE.
    • MMCF-7-AA demonstrated exceptional SO2 capture capacity (12.5 mmol g-1 at 1 bar) and performance at low partial pressures.
    • Structural and computational analyses confirmed the formation of cooperative binding sites responsible for the enhanced SO2 sorption.

    Conclusions:

    • The ISRE strategy provides a versatile blueprint for pore editing in MOFs, enabling the creation of sophisticated chemical environments.
    • The developed Zr-MMCFs exhibit superior SO2 capture capabilities, positioning them as advanced adsorbents for gas separation and purification.
    • This work highlights the potential of using simple precursor scaffolds as reactive matrices for designing functional porous materials.