Advanced ICT Research Institute, National Institute of Information and Communications Technology , 588-2 Iwaoka, Kobe 651-2492, Japan.
Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology , 4-2-1 Nukuikitamachi, Koganei, Tokyo 184-8795, Japan.
J Phys Chem B. 2017 Apr 13;121(14):3121-3129. doi: 10.1021/acs.jpcb.7b01429. Epub 2017 Mar 31.
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.
对具有不同烷基链长度的咪唑阳离子的离子液体 (ILs) 以及带有和不带有少量水的各种卤素或分子阴离子进行了红外光谱分析。在 3000 至 3200 cm 范围内，由于 C-H 振动模式引起的摩尔浓度归一化吸光度对于具有不同烷基链长度和相同阴离子的 ILs 几乎相同。发现 C-H 振动模式的红移、C(2)-H 质子的化学位移以及氢键相互作用的能量稳定之间存在密切相关性。研究了在 3300 至 3800 cm 范围内与阴离子相互作用的水分子的振动模式。讨论了水分子的振动频率、C-H 振动模式的频率以及由于离子对引起的分子间振动模式的中心频率之间的相关性。
