Abstract
A new nano-scale spherical vinyl-functionalized covalent organic polymer (TAPT-DVA-COP) with uniform sizes around 300 nm was initially constructed using 2,5-divinyl-1,4-benzaldehyde (DVA) and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) as monomers. Then, a sulfonic acid (-SO3H) modified COP termed COP-SO3H was developed based on post-sythesis method employing TAPT-DVA-COP as precursor. Capillary electrochromatography (CEC) monolithic columns were fabricated using the physical doping technique to exhibit the application potential of TAPT-DVA-COP and COP-SO3H. Compared to the TAPT-DVA-COP monolithic column, the COP-SO3H monolithic column achieved a highly selective separation between analytes with different properties, including monosubstituted benzenes, alkylbenzenes, hydroxybenzoates, nucleoside bases, and biogenic amines. Non-covalent interaction (NCI) analysis and experimental data show that the synergism of the sulfonic acid group and aromatic moieties on COP-SO3H endows the new stationary phase with diverse interactions, including ion exchange, hydrophobic, π-π and hydrogen bonding. In addition, the COP-SO3H monolithic column exhibited good reproducibility and excellent potential for the determination of hydroxybenzoates in compact powders and alkylbenzenes in effluent samples.
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Acknowledgements
We acknowledge financial support from the projects of National Natural Science Foundation of China (21974124, 22004109 and 22276177); China Postdoctoral Science Foundation (2022M710167) and Postdoctoral Research Grant in Henan Province (202102080).
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Shuyu Dai: Conceptualizatin, Methodology, Experiment, Formal analysis, Writing the original draft. Yun Guo: Methodology, Validation, Investigation. Hongyan Mao: Writing-review & editing. Xiaohui Wei: Methodology, Experiment supplement. Wenfen Zhang: Project administration, Writing—review & editing, Supervision, Funding acquisition. Xin Chen: Methodology, Experiment supplement. Wuduo Zhao: Writing—review & editing. Shusheng Zhang: Project administration, Writing—review & editing, Supervision, Funding acquisition.
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Dai, S., Guo, Y., Mao, H. et al. Sulfonic acid functionalized monolithic column for high selectivity capillary electrochromatography separation. Microchim Acta 190, 402 (2023). https://doi.org/10.1007/s00604-023-05994-7
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DOI: https://doi.org/10.1007/s00604-023-05994-7