Abstract
Porous liquids are a type of porous materials that engineer permanent porosity into unique flowing liquids, exhibiting promising functionalities for a variety of applications. Here a Type I porous liquid is synthesized by transforming porous organic cages into porous ionic liquids via a supramolecular complexation strategy. Simple physical mixing of 18-crown-6 with task-specific anionic porous organic cages affords a porous ionic liquid with anionic porous organic cages as the anionic parts and 18-crown-6/potassium ion complexes as the cationic parts. In contrast, mixing of 15-crown-5 and anionic porous organic cages in a 2:1 ratio gives only solids, while the addition of excess 15-crown-5 affords a Type II porous liquid. The permanent porosity in the cage-based porous liquids has been also confirmed by molecular simulation, positron (e+) annihilation lifetime spectroscopy, and enhanced gas sorption capacity compared with pure crown ethers.
| Original language | English |
|---|---|
| Pages (from-to) | 2268-2272 |
| Number of pages | 5 |
| Journal | Angewandte Chemie - International Edition |
| Volume | 59 |
| Issue number | 6 |
| DOIs | |
| State | Published - Feb 3 2020 |
Funding
This work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. We would like to thank Dr. Xunxiang Hu for assistance with PALS measurements.
Keywords
- crown ethers
- ionic liquids
- microporous materials
- porous liquids
- porous organic cages