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1-Butyl-3-methylimidazolium hexafluorophosphate ([C 4 MIM][PF 6 ])/DNA and 1-methyl-3-propylimidazolium hexafluorophosphate ([C 3 MIM][PF 6 ])/DNA mixtures were prepared and characterized by high-pressure infrared spectroscopy. Under ambient pressure, the imidazolium C 2 -H and C 4,5 -H absorption bands of [C 4 MIM][PF 6 ]/DNA mixture were red-shifted in comparison with those of pure [C 4 MIM][PF 6 ]. This indicates that the C 2 -H and C 4,5 -H groups may have certain interactions with DNA that assist in the formation of the ionic liquid/DNA association. With the increase of pressure from ambient to 2.5 GPa, the C 2 -H and C 4,5 -H absorption bands of pure [C 4 MIM][PF 6 ] displayed significant blue shifts. On the other hand, the imidazolium C-H absorption bands of [C 4 MIM][PF 6 ]/DNA showed smaller frequency shift upon compression. This indicates that the associated [C 4 MIM][PF 6 ]/DNA conformation may be stable under pressures up to 2.5 GPa. Under ambient pressure, the imidazolium C 2 -H and C 4,5 -H absorption bands of [C 3 MIM][PF 6 ]/DNA mixture displayed negligible shifts in frequency compared with those of pure [C 3 MIM][PF 6 ]. The pressure-dependent spectra of [C 3 MIM][PF 6 ]/DNA mixture revealed spectral features similar to those of pure [C 3 MIM][PF 6 ]. Our results indicate that the associated structures of [C 4 MIM][PF 6 ]/DNA are more stable than those of [C 3 MIM][PF 6 ]/DNA under high pressures.

Pressure-Dependent Stability of Imidazolium-Based Ionic Liquid/DNA Materials Investigated by High-Pressure Infrared Spectroscopy