Organic Ionic Crystals: Solid-Phase Structure and Thermal Properties of Dicationic α,ω-Bis[N,N′-(4-alkylpyridinium)]alkane Hexafluorophosphate Salts

Hyunho Chae, A. Reum Lee, Minyoung Yoon, U. Hyeok Choi, Gyungse Park, Minjae Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

As organic ionic crystals, C2-, C3-, and C4-alkylene α,ω-bis[N,N′-(4-alkylpyridinium)] PF6 salts are synthesized to investigate their thermal properties and phase behaviors along with chemical structure changes. The X-ray crystal structure of 1,2-bis[N,N′-(4-methylpyridinium)]ethane 2PF6 (2–1) showed that two pyridinium rings in one cation molecule and two pyridinium ring planes of neighboring molecules were exactly parallel. Multiple C−H⋅⋅⋅F hydrogen bonds were observed for all protons of the bis-pyridinium with PF6 anions. Interestingly, most of the prepared C2-bridged dicationic bis-pyridinium PF6 salts showed solid–solid phase transitions, which are typical features of soft crystalline materials, such as plastic and liquid crystals. Colorfully aligned crystalline textures of the polarized optical microscope images are formed with strong birefringence for the soft crystalline phase of 1,2-bis[N,N′-(4-n-propylpyridinium)]ethane PF6 , showing a low entropy of fusion (ΔSf=25.0 J mol−1 K−1). The C2-bridged n-undecyl (2–11) and n-dodecyl (2–12) salts exhibit a very soft solid phase, showing large heat absorptions and entropy changes during their multiple solid-solid phase transitions. Additionally, the C3- and C4-bridged dicationic (bis)pyridinium PF6 salts are prepared to determine the property changes with different bridge lengths. The longer alkylene connected salts are thermally more stable than the C2-bridged compounds and show only one melting phase transition.

Original languageEnglish
Pages (from-to)1718-1725
Number of pages8
JournalAsian Journal of Organic Chemistry
Volume8
Issue number9
DOIs
StatePublished - 1 Sep 2019

Keywords

  • dicationic pyridinium ions
  • liquid crystals
  • phase transitions
  • thermal stability
  • X-ray structure

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