Multiphase Coexistence in an Ionic Liquid: 1-Decyl-3-methylimidazolium Nitrate.

Complicated phase transitions were observed in a single-component 1-decyl-3-methylimidazolium nitrate ([Cmim][NO]) ionic liquid (IL) using Raman spectroscopy and synchrotron small- and wide-angle X-ray scattering (SWAXS). Time-resolved synchrotron SWAXS could distinguish the phase transitions depending upon the cooling rate. Low- peaks representing a few kinds of layered structures were decomposed.

A phase variety of fluorinated ionic liquids: Molecular conformational and crystal polymorph.

Crystal polymorphs of fluorinated ionic liquids (fILs) were examined at low-temperature (LT) by Raman spectroscopy. The fILs were 1-alkyl-3-methylimidazolium perfluorobutanesulfonate, [Cmim][PFBS] (n = 4, 6, and 8). The cations and anion possess conformational degrees of freedom.

Long Periodic Structure of a Room-Temperature Ionic Liquid by High-Pressure Small-Angle X-Ray Scattering and Wide-Angle X-Ray Scattering: 1-Decyl-3-Methylimidazolium Chloride.

The Bragg reflections of 1-decyl-3-methylimidazolium chloride ([C mim][Cl]), a room-temperature ionic liquid, are observed in a lowly scattered wavevector (q) region using high-pressure (HP) small-angle X-ray scattering methods. The HP crystal of [C mim][Cl] was characterized by an extremely long periodic structure. The peak position at the lowest q (1.

Low-temperature and high-pressure phases of a room-temperature ionic liquid and polyiodides: 1-methyl-3-propylimidazolium iodide.

Using simultaneous small-angle X-ray scattering (SAXS) combined with differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) combined with DSC measurements, low-temperature (LT) solid phases of a room-temperature ionic liquid (RTIL) and its mixtures were examined at ambient pressure. The considered RTIL was 1-methyl-3-propylimidazolium iodide ([Cmim][I]), and the mixtures could be expressed as [Cmim][I]. Under high-pressure (HP), the crystallization of pure [Cmim][I] was suppressed, as a LT-amorphous form of pure [Cmim][I] was formed.