Coordination cages integrated into swelling poly(ionic liquid)s for guest encapsulation and separation

Xiang Zhang, Dawei Zhang (), Chenyang Wei, Dehua Wang (), Roy Lavendomme, Shuo Qi, Yu Zhu, Jingshun Zhang, Yongya Zhang, Jiachen Wang, Lin Xu, En-Qing Gao, Wei Yu, Hai-Bo Yang () and Mingyuan He ()
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Xiang Zhang: East China Normal University
Dawei Zhang: East China Normal University
Chenyang Wei: East China Normal University
Dehua Wang: SINOPEC Research Institute of Petroleum Processing
Roy Lavendomme: CP160/06
Shuo Qi: Shanghai Jiao Tong University
Yu Zhu: Shanghai Jiao Tong University
Jingshun Zhang: East China Normal University
Yongya Zhang: East China Normal University
Jiachen Wang: East China Normal University
Lin Xu: East China Normal University
En-Qing Gao: East China Normal University
Wei Yu: Shanghai Jiao Tong University
Hai-Bo Yang: East China Normal University
Mingyuan He: East China Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Coordination cages have been widely reported to bind a variety of guests, which are useful for chemical separation. Although the use of cages in the solid state benefits the recycling, the flexibility, dynamicity, and metal-ligand bond reversibility of solid-state cages are poor, preventing efficient guest encapsulation. Here we report a type of coordination cage-integrated solid materials that can be swelled into gel in water. The material is prepared through incorporation of an anionic FeII4L6 cage as the counterion of a cationic poly(ionic liquid) (MOC@PIL). The immobilized cages within MOC@PILs have been found to greatly affect the swelling ability of MOC@PILs and thus the mechanical properties. Importantly, upon swelling, the uptake of water provides an ideal microenvironment within the gels for the immobilized cages to dynamically move and flex that leads to excellent solution-level guest binding performances. This concept has enabled the use of MOC@PILs as efficient adsorbents for the removal of pollutants from water and for the purification of toluene and cyclohexane. Importantly, MOC@PILs can be regenerated through a deswelling strategy along with the recycling of the extracted guests.

Date: 2024
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DOI: 10.1038/s41467-024-48135-1

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