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Robust Supramolecular Nano-Tunnels Built from Molecular Bricks*.
Peifa Wei1,2, Xuan He2, Zheng Zheng1
1Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, SCUT-HKUST Joint Research Institute, Institute for Advanced Study, Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
A novel ionic molecule self-assembles into a supramolecular nano-tunnel, demonstrating selective carbon dioxide adsorption and vapochromic properties. This stable material offers potential for gas separation and sensing applications.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Crystal Engineering
Background:
- Supramolecular organic frameworks (SOFs) often lack chemical stability, limiting their applications.
- Designing materials with selective guest adsorption and responsive properties is a key challenge.
Purpose of the Study:
- To report a linear ionic molecule that self-assembles into a nano-tunnel structure.
- To investigate the guest adsorption behavior, thermal and chemical stability, and responsive properties of the resulting material.
Main Methods:
- Self-assembly driven by trident-type ionic and π-π stacking interactions.
- Single-crystal X-ray diffraction to analyze crystal structure and phase transformations.
- Gas adsorption measurements to evaluate CO2 uptake and selectivity.
- Spectroscopic analysis to study vapochromic behavior.
Main Results:
- A supramolecular nano-tunnel crystal was successfully assembled.
- The material exhibited anisotropic guest adsorption, good thermal stability, and multi-stage single-crystal-to-single-crystal phase transformations.
- Remarkable chemical stability under acidic and basic conditions was observed.
- High CO2 adsorption capacity and selectivity over CH4 were achieved due to polar tunnels.
- Aggregation-induced emission led to vapochromic properties.
Conclusions:
- The reported ionic molecule forms a stable supramolecular nano-tunnel with unique adsorption and responsive characteristics.
- This material demonstrates significant potential for selective CO2 capture and sensing applications.
- The design strategy offers a new route for developing robust and functional supramolecular materials.
