Department of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Chem Commun (Camb). 2011 Dec 21;47(47):12676-8. doi: 10.1039/c1cc14817f. Epub 2011 Oct 31.
The temperature dependence of the N-H proton chemical shift in protic ionic liquids (PILs) and FT-IR spectra of the N-H bonds indicated the presence of strong hydrogen bonds between the protonated cation and the anion, depending on the ΔpK(a) of the constituent acid and base, and their successive breaking with temperature, which may explain the characteristic properties of PILs such as relatively low ionicity and its decrease with temperature.
质子离子液体（PILs）中 N-H 质子化学位移的温度依赖性和 N-H 键的 FT-IR 谱表明，质子化阳离子和阴离子之间存在强氢键，这取决于组成酸和碱的 ΔpK(a)，以及它们随温度的连续断裂，这可以解释 PILs 的特征性质，例如相对较低的离子性及其随温度的降低。
