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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Developing porous crystalline materials using supramolecular secondary building units (SSBUs) is a key area in reticular chemistry.
  • Assembly of hydrogen-bonded frameworks from polynuclear clusters stabilized by non-covalent interactions presents significant challenges.

Purpose of the Study:

  • To present a novel strategy for stabilizing SSBUs by controlling π-stacking geometry.
  • To create hydrogen-bonded frameworks with tunable architectures for gas separation applications.

Main Methods:

  • Tuning π-stacking geometry of conjugated building blocks, specifically aromatic heterocycles with carboxyl groups.
  • Utilizing ammonium cations to bridge carboxylates, forming stable SSBUs ([NH4+]8[COO-]8, SSBU-4).
  • Investigating solvent effects on framework assembly and porosity.

Main Results:

  • Parallel-displaced π-π stacking in heterocycles facilitated the formation of stable SSBU-4, leading to porous hydrogen-bonded frameworks.
  • Frameworks exhibited permanent porosity and structural diversity influenced by solvent choice.
  • Non-heterocyclic building blocks resulted in unstable frameworks due to unfavorable π-stacking.

Conclusions:

  • The developed strategy successfully stabilizes SSBUs for constructing robust hydrogen-bonded frameworks.
  • The heterocycle-based frameworks possess accessible Brønsted acid N-H sites, enabling high ammonia adsorption capacity.
  • These materials show promise for industrial gas separation, particularly for ammonia capture.