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Ultrafast preparation of a polyhedral oligomeric silsesquioxane-based ionic liquid hybrid monolith via photoinitiated polymerization, and its application to capillary electrochromatography of aromatic compounds

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Abstract

An ionic liquid hybrid monolithic capillary column was prepared within 7 min via photoinitiated free-radical polymerization of an ionic liquid monomer (1-butyl-3-vinylimidazolium-bis[(trifluoromethyl)sulfonyl]imide); VBIMNTF2) and a methacryl substituted polyhedral oligomeric silsesquioxane (POSS-MA) acting as a cross-linker. The effects of composition of prepolymerization solution and initiation time on the porous structure and electroosmotic flow (EOF) of monolithic column were investigated. The hybrid monolith was characterized by scanning electron microscopy and FTIR. Owing to the introduction of a rigid nanosized POSS silica core and ionic liquids with multiple interaction sites, the monolithic column has a well-defined 3D skeleton morphology, good mechanical stability, and a stable anodic electroosmotic flow. The hybrid monolithic stationary phase was applied to the capillary electrochromatographic separation of various alkylbenzenes, phenols, anilines and polycyclic aromatic hydrocarbons (PAHs). The column efficiency is highest (98,000 plates/m) in case of alkylbenzenes. Mixed-mode retention mechanisms including hydrophobic interactions, π-π stacking, electrostatic interaction and electrophoretic mobility can be observed. This indicates the potential of this material in terms of efficient separation of analytes of different structural type.

Preparation of a mixed-mode ionic liquid hybrid monolithic column via photoinitiated polymerization of methacryl substituted polyhedral oligomeric silsesquioxane (POSS-MA) and 1-butyl-3-vinylimidazolium-bis[(trifluoromethyl)sulfonyl]imide (VBIMNTF2) ionic liquid for use in capillary electrochromatography.

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Acknowledgements

The authors are grateful for financial support from the National Natural Science Foundation of China (21375019), Special-funded Program on National Key Scientific Instruments and Equipment Development of China (2011YQ150072), and the Program for Changjiang Scholars and Innovative Research Team in University of China (IRT15R11).

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Authors and Affiliations

  1. Key Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province); College of Chemistry, Fuzhou University, Fuzhou, 350108, People’s Republic of China

    Bingyu Zhang, Xiaoyun Lei, Lijun Deng, Minsheng Li, Sicong Yao & Xiaoping Wu

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  1. Bingyu Zhang
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Correspondence to Xiaoping Wu.

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Zhang, B., Lei, X., Deng, L. et al. Ultrafast preparation of a polyhedral oligomeric silsesquioxane-based ionic liquid hybrid monolith via photoinitiated polymerization, and its application to capillary electrochromatography of aromatic compounds. Microchim Acta 185, 318 (2018). https://doi.org/10.1007/s00604-018-2847-x

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