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Structural-Deformation-Energy-Modulation Strategy in a Soft Porous Coordination Polymer with an Interpenetrated
Yifan Gu1,2, Jia-Jia Zheng1,3, Ken-Ichi Otake1
1Institute for Integrated Cell-Material Sciences, Kyoto University Institute for Advanced Study, Kyoto University, Yoshida Ushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan.
Angewandte Chemie (International Ed. in English)
|April 3, 2020
Summary
Researchers developed a strategy to control the flexibility of porous coordination polymers (PCPs) by modulating their structural deformation energy (Edef). This allows for selective guest uptake, demonstrated by distinguishing between two chlorinated solvents.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Chemical Engineering
Background:
- Controlling the flexibility of porous coordination polymers (PCPs) is crucial for achieving unique molecular-recognition patterns.
- The interplay between structural deformation energy (Edef) and guest interactions governs guest-triggered structural transformations in soft PCPs.
- Existing methods for regulating PCP flexibility and guest selectivity remain limited.
Purpose of the Study:
- To develop a strategy for rational control over PCP flexibility by modulating Edef.
- To investigate the influence of Edef on guest-triggered structural transformations.
- To demonstrate selective guest uptake in soft PCPs.
Main Methods:
- Encoding inter-framework hydrogen bonds into a soft PCP with an interpenetrated structure to modulate Edef.
- Thermodynamic analysis of the competition between Edef and guest interactions.
- Gas adsorption experiments to evaluate guest selectivity.
Main Results:
- Successfully modulated the Edef of the soft PCP through the introduction of inter-framework hydrogen bonds.
- The enhanced Edef led to a selective gate-opening behavior, enabling the PCP to uptake CHCl3 preferentially over CH2Cl2.
- Demonstrated a modified adsorption-energy landscape resulting from the Edef modulation.
Conclusions:
- Encoding inter-framework hydrogen bonds is an effective strategy for modulating Edef and controlling PCP flexibility.
- This approach enables the design of soft PCPs with selective guest-triggered structural transformations.
- Provides a new direction for designing functional soft porous materials with tailored molecular recognition capabilities.
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