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Published on: September 5, 2018
Supramolecular Protection-Deprotection for Switching Pore-Surface Functionality in a Crystalline Porous Organic Salt
Kazuki Shiga1, Ryota Yamazaki1, Hajime Shigemitsu2
1Department of Applied Chemistry, Graduate School of Engineering, The University of Osaka, Suita, Osaka, Japan.
Angewandte Chemie (International Ed. in English)
|August 5, 2026
Summary
Researchers developed a supramolecular protection-deprotection strategy for porous materials. This method allows controlled emergence of pore-surface functionality, enhancing ammonia uptake in crystalline porous materials.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Crystalline Porous Materials
Background:
- Installing functional groups on porous materials is challenging.
- Functional groups can interfere with framework formation.
- Controlling pore surface functionality is key for material applications.
Purpose of the Study:
- To develop a method for temporally separating framework construction and pore-surface functionality.
- To investigate supramolecular protection-deprotection in porous organic salts.
- To control the emergence of porosity and functionality in dynamic crystalline materials.
Main Methods:
- Utilized supramolecular protection-deprotection strategy.
- Employed hydrogen bonding with dimethyl sulfoxide (DMSO) to protect phenolic OH groups during crystallization.
- Induced single-crystal-to-single-crystal phase transitions by stepwise removal and re-exposure to DMSO.
Main Results:
- Successfully formed a crystalline framework with protected functional groups.
- Achieved a two-step phase transition from a dormant to an active state, exposing pore-surface functionality.
- Demonstrated enhanced ammonia uptake and preferential adsorption of ammonia over other gases in the active state.
Conclusions:
- Supramolecular protection-deprotection is an effective strategy for dynamic crystalline porous materials.
- This method allows temporal control over pore-surface functionality.
- The developed strategy enhances gas adsorption properties, particularly for ammonia.
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