Adjusting the chromatographic properties of poly(ionic liquid)‐modified stationary phases by substitution on the imidazolium cation

Poly(ionic liquid)‐modified stationary phases can have multiple interactions with solutes. However, in most stationary phases, separation selectivity is adjusted by changing the poly(ionic liquid) anions. In this work, two poly(ionic liquid)‐modified silica stationary phases were prepared by introdu...

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Bibliographic Details
Published in:Journal of separation science 2020-07, Vol.43 (14), p.2766-2772
Main Authors: Wang, Jie, Tang, Yuqi, Chu, Huiyuan, Shen, Jiwei, Wang, Chaozhan, Wei, Yinmao
Format: Article
Language:English
Subjects:
Cation exchanging
Cationic polymerization
Ionic liquids
Ions
mixed‐mode chromatography
Phases
poly(ionic liquids)
Selectivity
Separation
Silicon dioxide
Solvents
stationary phases
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Summary:Poly(ionic liquid)‐modified stationary phases can have multiple interactions with solutes. However, in most stationary phases, separation selectivity is adjusted by changing the poly(ionic liquid) anions. In this work, two poly(ionic liquid)‐modified silica stationary phases were prepared by introducing the cyano or tetrazolyl group on the pendant imidazolium cation on the polymer chains. Various analytes were selected to investigate their mechanism of retention in the stationary phases using different mobile phases. Two poly(ionic liquid)‐modified stationary phases can provide various interactions toward solutes. Compared to the cyano‐functionalized poly(ionic liquid) stationary phase, the tetrazolyl‐functionalized poly(ionic liquid) stationary phase provides additional cation‐exchange and π‐π interactions, resulting in different separation selectivity toward analytes. Finally, applicability of the developed stationary phases was demonstrated by the efficient separation of nonsteroidal anti‐inflammatory drugs.
ISSN:1615-9306
1615-9314
DOI:10.1002/jssc.202000189