A Macrocycle-Based Supramolecular Strategy for Interchangeable Screwdriver-Like on-Demand Post-Functionalization of...

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Nanotechnology

Background:

• Post-functionalization of covalent organic frameworks (COFs) is crucial for applications but faces challenges like limited reactions and difficulty in modifying functions.
• Existing methods often require tedious precursor synthesis and parameter screening, hindering rapid development.

Purpose of the Study:

• To develop a versatile, noncovalent post-functionalization strategy for COFs using a macrocycle-based supramolecular approach.
• To demonstrate tunable functionalization and recyclability of COFs on a single platform.

Main Methods:

• Incorporation of pillar[5]arene (P5A) macrocycles into the COF structure to act as hosts.
• Utilizing host-guest interactions to anchor various functional electron-deficient guests.
• Demonstrating applications such as iodine capture and metal ion separation using specific guests.

Main Results:

• Successful implementation of variable noncovalent post-functionalization on a single COF platform.
• Demonstrated tunable COF functionalities for specific tasks like iodine capture and metal ion separation.
• Showcased the recyclability and reusability of the COF by removing and replacing guests.

Conclusions:

• A general, noncovalent strategy for on-demand, interchangeable post-functionalization of COFs has been established.
• This approach offers a flexible and efficient way to customize COF properties for diverse applications.
• The macrocycle-based method overcomes limitations of traditional covalent functionalization, enabling easier modification and recycling.