Porous Halogen-Bonded Frameworks Assembled through Hetero-polytopic Ion Pair Templation.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Crystallography

Background:

• Halogen-bonding (XB) interactions are key in crystalline framework design.
• Porous 3D frameworks utilizing XB interactions are challenging to synthesize.
• Anionic XB acceptors enhance interactions but often lead to disruptive cations.

Purpose of the Study:

• To design and synthesize a novel porous 3D framework material.
• To utilize halogen-bonding (XB) for framework construction.
• To address the challenge of cation disruption in XB-based frameworks.

Main Methods:

• Preparation of a tetratopic XB donor with a crown ether moiety.
• Crystallization of the donor with sodium chloride (NaCl).
• Characterization of the resulting 3D framework structure and porosity.

Main Results:

• A novel tetratopic XB donor was synthesized, incorporating a crown ether for sodium ion sequestration.
• Crystallization with NaCl yielded a 3D framework material.
• The resulting framework exhibited porosity to solvent and vapor.
• The material demonstrated single-crystal-to-single-crystal reactivity.

Conclusions:

• A new strategy for creating porous 3D frameworks using halogen-bonding (XB) has been demonstrated.
• The designed XB donor effectively sequesters sodium cations, preventing framework disruption.
• The resulting porous material has potential applications in solvent and vapor interactions.