Characterization of the ionic clathrate hydrate of tetra- n -butylammonium acrylate

Sanehiro Muromachi, Masato Kida, Satoshi Takeya, Yoshitaka Yamamoto, Ryo Ohmura

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10 Citations (Scopus)

Abstract

The ionic clathrate hydrate of tetra-n-butylammonium (TBA) acrylate was characterized using single-crystal X-ray diffraction, elemental analysis, and nuclear magnetic resonance (NMR) spectroscopy. The crystal structure of TBA acrylate was Jeffrey's type III and tetragonal P42/n, with a 33.076(7) × 33.076(7) × 12.170(2) Å3 unit cell. The volume of the unit cell was 13315(5) Å3, which is almost twice that of the ideal structure. The TBA cation was disordered and located in two types of fused cages. Although the acrylate anion was located in a pentagonal dodecahedral cage neighboring the TBA cation, there is a residual acrylate anion that could be around the other TBA cation in the unit cell. Solid-state 13C NMR spectra showed that the TBA cation was clearly disordered at 173 K, but not at 239 K. NMR peaks from the acrylate anion were not observed at either temperature. This is probably because of the strong restriction on the acrylate anion by hydrogen bonding with the lattice water. Some of the characteristics of the anion and cation of the ionic guest incorporated in the hydrate structure have yet to be defined. Further research is needed to clarify complexation of the ionic clathrate hydrate and the ionic guest, and the resulting structure.

Original languageEnglish
Pages (from-to)954-959
Number of pages6
JournalCanadian Journal of Chemistry
Volume93
Issue number9
DOIs
Publication statusPublished - 2015 Apr 10

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Keywords

  • Ionic clathrate hydrate
  • Nuclear magnetic resonance
  • Single-crystal X-ray structural analysis
  • Tetra- n -butylammonium acrylate

ASJC Scopus subject areas

  • Chemistry(all)
  • Organic Chemistry
  • Catalysis

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