Abstract
An ionic liquid (IL) with conformational polymorphs indicated complicated phase transitions under high pressure (HP). The IL was 1-hexyl-3-methylimidazolium perfluorobutanesulfonate ([C6mim][PFBS]), which has cationic and anionic conformational degrees of freedom. Using HP Raman spectroscopy, a competition between cation and anion conformers corresponded to the HP crystal polymorph. The folding cation appeared at 3.7 GPa due to its flexibility. The rigid [PFBS]− anion also formed the gauche‘ conformer at 7.6 GPa for higher packing efficiency. The conformational flexibility was adjusted depending on pressure. The pressure-variant/invariant conformations were connected with the HP crystal polymorph of [C6mim][PFBS].
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