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Published on: March 24, 2018
Hydrogen bonds in protic ionic liquids and their correlation with physicochemical properties.
Muhammed Shah Miran1, Hiroshi Kinoshita, Tomohiro Yasuda
1Department of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Strong hydrogen bonds in protic ionic liquids (PILs) break with increasing temperature. This bond behavior explains the characteristic low ionicity of PILs and its temperature-dependent decrease.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Protic ionic liquids (PILs) exhibit unique properties influenced by inter-ionic interactions.
- Understanding the temperature dependence of these interactions is crucial for their application.
Purpose of the Study:
- To investigate the temperature-dependent behavior of hydrogen bonds in PILs.
- To correlate hydrogen bond dynamics with the characteristic properties of PILs.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy to measure N-H proton chemical shift.
- Fourier-Transform Infrared (FT-IR) spectroscopy to analyze N-H bond vibrations.
Main Results:
- Temperature dependence of N-H chemical shift indicates strong hydrogen bonding between cations and anions.
- FT-IR spectra confirm the presence and temperature-induced breaking of N-H bonds.
- Hydrogen bond strength is influenced by the pKa difference of the constituent acid and base.
Conclusions:
- The observed hydrogen bond dynamics explain the relatively low ionicity of PILs.
- The decrease in ionicity with increasing temperature is attributed to the successive breaking of hydrogen bonds.
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