离子液体Ammoeng 100与水之间相互作用的红外光谱分析

The infrared spectral analysis of interaction between ionic liquid Ammoeng 100 and water

本文研究测量了Ammoeng 100与其水溶液在不同压力环境下的红外光谱,以期了解该离子液体与水之间的相互作用.结果表明,Ammoeng 100与水之间的相互作用主要来自离子液体的阴离子与水分子,且两者会根据能量稳定性而有选择性的接近;相对于阴离子,Ammoeng 100的烷基链受D_2O的扰动不大.与纯Ammoeng 100相比,在Ammoeng 100/D_2O的红外光谱中显示烷基C-H伸缩振动频率并没有太大变化,而压力小于1.0 GPa时D_2O会造成在Ammoeng 100的S=O对称伸缩振动频率红移.压力大于1.0GPa时,纯Ammoeng 100与Ammoeng 100/D_2O中的S=O对称伸缩振动频率大同小异,表明高压环境下D_2O不会对阴离子的对称伸缩振动频率造成明显影响,同时也显示离子液体在极性区的缔合结构会受到高压的扰动而有显著变化.

For analyzing the abnormal phenomenon, the infrared spectra of Ammoeng 100 and its aqueous solu- tion at different pressures were measured in order to understand the interaction between this ionic liquid and wa- ter in this study. The results indicated that the interaction between Ammoeng 100 and water is mainly from anions and water molecules and they approached selectively according to the energy stability, while the alkyl chain per- turbed little relative to anions. Compare to pure Ammoeng, the stretching vibration frequency of C - H show in infrared spectra of Ammoeng 100/D2O change very little and the symmetric stretching vibration frequency of S = 0 of Ammoeng 100 have a red - shift induce by D20 under 1.0 GPa. the symmetric stretching vibration frequen- cies of S = 0 of pure Ammoeng 100 and Ammoeng 100/D20 are very much the same above 1.0 GPa and it sug- gest the effect of D2O on symmetric stretching vibration frequency of anion is not significant and the associative structure of ionic liquid in polar region is significantly change due to the disturbance of high pressure.