Ionic plastic phase in piperidinium hexafluorophosphate studied by solid nmr, x-ray diffraction, and thermal measurements

Hiroshi Ono, Shin'ichi Ishimaru, Ryuichi Ikcda, Hiroyuki Ishida

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Measurements of 1H, 19F, and 31P NMR, differential scanning calorimetry (DSC) and X-ray powder diffraction were carried out in piperidinium hexafluorophosphate ([C5H10NH2]PF6). Three solid phases were observed by DSC in the range from 150 K to the melting point of 517 K. The highest-temperature phase was determined to form a CsCl-type cubic lattice with a=6.21(3) Å, Z=l, V= 240(4) Å3, and Dx= 1.60(3) Mg m-3. From the NMR measurements in this phase, both cation and anion were revealed to perform self-diffusion as well as isotropic rotation. These molecular motions and thermal properties indicate that this phase is an ionic plastic phase.

Original languageEnglish
Pages (from-to)650-655
Number of pages6
JournalBerichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
Volume102
Issue number4
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

Keywords

  • Diffusion
  • Ionic plastic crystal
  • Nuclear magnetic resonance
  • Phase transitions
  • Spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)

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