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

Abstract

By 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 their mixtures were examined at ambient pressure. The considered RTIL was 1-methyl-3-propylimidazolium iodide ([C3mim][I]), and the mixture could be expressed as [C3mim][Im]. Under high-pressure (HP), the crystallization of pure [C3mim][I] was suppressed, as LT-amorphous form of pure [C3mim][I] was formed. In the mixed system, the HP crystallization of [C3mim][I3] occurred at 0.95 GPa being compressed. In [C3mim][I3.66] as a non-stoichiometric system, complicated phase changes were observed. Upon compression, the edge of a sample container was crystallized. By further compression, a crystal-crystal phase transition as an HP-crystal polymorph appeared. In the central part, HP amorphization was observed upon compression, whereas decompression crystallization was induced by decreasing the pressure. The HP complicated behaviors of non-stoichiometric [C3mim][I3.66] are caused by excess iodide/iodine.

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Publication details

The article was accepted on 24 May 2017 and first published on 24 May 2017


Article type: Paper
DOI: 10.1039/C7FD00172J
Citation: Faraday Discuss., 2017, Accepted Manuscript
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    Low-temperature and high-pressure phases of room-temperature ionic liquid and polyiodides: 1-Methyl-3-propylimidazolium iodide

    H. Abe, H. Kishimura, M. Takaku, M. Watanabe and N. Hamaya, Faraday Discuss., 2017, Accepted Manuscript , DOI: 10.1039/C7FD00172J

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