Introduction of an Ionic Liquid into the Micropores of a Metal-Organic Framework and Its Anomalous Phase Behavior

Kazuyuki Fujie, Teppei Yamada, Ryuichi Ikeda, Hiroshi Kitagawa

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)

Abstract

Controlling the dynamics of ionic liquids (ILs) is a significant issue for widespread use. Metal-organic frameworks (MOFs) are ideal host materials for ILs because of their small micropores and tunable host-guest interactions. Herein, we demonstrate the first example of an IL incorporated within the micropores of a MOF. The system studied consisted of EMI-TFSA (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide) and ZIF-8 (composed of Zn(MeIM)2; H(MeIM)=2-methylimidazole) as the IL and MOF, respectively. Construction of the EMI-TFSA in ZIF-8 was confirmed by X-ray powder diffraction, nitrogen gas adsorption, and infrared absorption spectroscopy. Differential scanning calorimetry and solid-state NMR measurements showed that the EMI-TFSA inside the micropores demonstrated no freezing transition down to 123K, whereas bulk EMI-TFSA froze at 231K. Such anomalous phase behavior originates from the nanosize effect of the MOF on the IL. This result provides a novel strategy for stabilizing the liquid phase of the ILs down to a lower temperature region.

Original languageEnglish
Pages (from-to)11302-11305
Number of pages4
JournalAngewandte Chemie - International Edition
Volume53
Issue number42
DOIs
Publication statusPublished - Oct 1 2014

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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