AI Article Synopsis
- Infrared spectroscopy was used to analyze ionic liquids (ILs) with imidazolium cations of varying alkyl chain lengths and different halogen or molecular anions, with some samples containing a small amount of water.
- The study found that the molar concentration normalized absorbance for C-H vibrational modes (3000-3200 cm) was consistent across ILs with different alkyl chains when the anions were the same.
- There was a significant relationship between the red-shifted C-H vibrational modes, the C(2)-H proton chemical shift, and the stabilization energy from hydrogen bonding, as well as correlations between the vibrational frequencies of water and ion pair modes.
Article Abstract
Infrared spectroscopy was performed on ionic liquids (ILs) that had imidazolium cations with different alkyl chain lengths and various halogen or molecular anions with and without a small amount of water. The molar concentration normalized absorbance due to C-H vibrational modes in the range of 3000 to 3200 cm was nearly identical for ILs that had imidazolium cations with different alkyl chain lengths and the same anions. A close correlation was found between the red-shifted C-H vibrational modes, the chemical shift of C(2)-H proton, and the energy stabilization of the hydrogen-bonding interaction. The vibrational modes of the water molecules interacting with anions in the range between 3300 and 3800 cm was examined. The correlation between the vibrational frequencies of water, the frequencies of C-H vibrational modes, and the center frequency of intermolecular vibrational modes due to ion pairs was discussed.
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| http://dx.doi.org/10.1021/acs.jpcb.7b01429 | DOI Listing |
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