Giant oligomeric porous cage-based molecules.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Nanotechnology

Background:

• Porous materials typically exist as extended networks or discrete cavities.
• Porous structures of intermediate size, bridging these extremes, remain underexplored.
• Metal-organic polyhedra (MOPs) offer tunable porous architectures.

Purpose of the Study:

• To synthesize and characterize novel oligomeric porous molecules with a finite number of MOP units.
• To explore the stepwise linkage of discrete MOPs into larger, well-defined structures.
• To investigate the properties of these intermediate-sized porous materials.

Main Methods:

• Synthesis of 1-connected (1-c) MOPs with a single azide reactive site.
• Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry for MOP linkage.
• Characterization of resulting dimeric, tetrameric, and satellite-like giant oligomeric molecules.

Main Results:

• Successfully prepared soluble, permanently porous giant molecules through stepwise MOP assembly.
• Demonstrated the formation of defined oligomeric structures (dimeric, tetrameric, satellite-like).
• Established a method for creating intermediate-sized porous materials from discrete MOP building blocks.

Conclusions:

• The study introduces a new class of intermediate-sized porous materials based on oligomeric MOPs.
• These giant molecules are water-soluble and retain porosity in the solid state.
• The findings open avenues for designing bespoke porous materials with controlled architectures.