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Updated: Jan 3, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Transforming Porous Organic Cages into Porous Ionic Liquids via a Supramolecular Complexation Strategy
Kecheng Jie1,2, Nicole Onishi3, Jennifer A Schott1,2
1Department of Chemistry, The University of Tennessee, Knoxville, Tennessee, 37996-1600, USA.
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.
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