Abstract
The phase behavior of 1-ethyl-3-methylimidazolium nitrate ([emim][NO3]) was investigated at 298K under high pressures, reaching 8.6GPa, by Raman spectroscopy. This compound was found to crystallize at 0.4GPa. The crystalline state of [emim][NO3] seems to undergo, at least, three more phase changes under the present experimental conditions. The conformational isomerism of the [emim]+ cation between planar and nonplanar forms was also investigated. Remarkably, these crystals showed drastic conformational changes upon phase changes, concomitant with the appearance of a new Raman peak attributable to the planar [emim]+ cation. This behavior contrasts markedly with previous results obtained for 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]), which showed pressure-induced amorphization at 2.8GPa.
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