Recent Advances in Hierarchical Porous Organic Cages: From Discrete Structure to Integrated Assemblies

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Nanotechnology

Background:

• Nature's functional complexity arises from multiscale hierarchical assembly.
• Porous organic cages (POCs) offer tunable cavities and solution processability for materials engineering.

Purpose of the Study:

• To highlight POCs as modular building blocks for hierarchical materials.
• To demonstrate how POCs enable rational construction of sophisticated material systems.

Main Methods:

• Utilizing POCs as enzyme-mimetic hosts for metal clusters (MCs).
• Integrating POCs into extended frameworks (COFs, MOFs, supramolecular frameworks).
• Constructing nested host-in-host architectures and multiscale crystalline materials.

Main Results:

• POCs stabilize encapsulated metal clusters within discrete cavities.
• Hierarchical assembly preserves porosity and enhances mass/electron transport.
• Developed materials show improved separation and catalytic performance.

Conclusions:

• POCs provide a programmable route to multifunctional materials by translating bioinspired design.
• Hierarchical assembly of POCs integrates structural advantages across length scales.
• POC-based materials offer enhanced performance through rational design.