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Transforming Porous Organic Cages into Porous Ionic Liquids via a Supramolecular Complexation Strategy
Author(s) -
Jie Kecheng,
Onishi Nicole,
Schott Jennifer A.,
Popovs Ilja,
Jiang Deen,
Mahurin Shan,
Dai Sheng
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201912068
Subject(s) - porosity , ionic liquid , supramolecular chemistry , sorption , porous medium , chemical engineering , materials science , ionic bonding , mixing (physics) , chemistry , inorganic chemistry , ion , organic chemistry , molecule , composite material , catalysis , adsorption , engineering , physics , quantum mechanics
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.