Abstract
The phase transitions of a fluorinated ionic liquid (fIL) were examined at low temperature (LT) by X-ray diffraction and Raman spectroscopy. The fIL was 1-ethyl-3-methylimidazolium perfluorobutanesulfonate ([C2mim][PFBS]). The cation and anion possessed conformational degrees of freedom. The trans and gauche conformers of [PFBS]– coexisted in the liquid state. The LT crystal polymorph of the [C2mim][PFBS] was observed, and [C2mim][PFBS] possessed the large unit cells. The gauche’ conformer of [PFBS]– appeared, accompanying with the phase transition at 220 K.
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