A new ionic liquid-based high-performance liquid chromatography stationary phase is reported. A derivative of N-methyl pyrrolidinium tetrafluoroborate was covalently immobilized on the surface of silica parti-cles to prepare silica-based N-methyl pyrrolidinium tetrafluoroborate ( SilprMP BF4 ) stationary phase. The obtained ionic liquid-modified silica was evaluated and confirmed by elemental analysis, infrared spectroscopy, and thermogravimetric analysis. A column was packed with the modified particles. The retention behavior of aromatic compounds, alkyl benzenes, and acidic and basic compounds on the SilprMP BF4 stationary phase was studied under reversed-phase liquid chromatography conditions. The effect of the eluent pH on the separa-tion of the acidic and basic compounds was also studied. The new stationary phase involves multiple retention mechanisms, such as electrostatic, hydrophobic, ion-dipole, and anion-exchange interactions, which might lead to multipurpose separation media.
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