Clusters of Imidazolium-Based Ionic Liquid in Benzene Solutions
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- 作者：Takuya Shimomura ; Toshiyuki Takamuku ; Toshio Yamaguchi
- 刊名：Journal of Physical Chemistry B
- 出版年：2011
- 出版时间：July 7, 2011
- 年：2011
- 卷：115
- 期：26
- 页码：8518-8527
- 全文大小：1042K
- 年卷期：v.115,no.26(July 7, 2011)
- ISSN：1520-5207
文摘
Cluster formation of 1-dodecyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide (C12mim+TFSA鈥?/sup>) in benzene solutions was investigated using small-angle neutron scattering (SANS), NMR, attenuated total reflectance infrared (ATR-IR), and large-angle X-ray scattering (LAXS) techniques. The SANS measurements revealed that C12mim+TFSA鈥?/sup> is heterogeneously mixed with benzene in the narrow range of benzene mole fraction 0.9 鈮?xC6D6 鈮?0.995 with a maximum heterogeneity at xC6D6 鈮?0.99. The NMR results suggested that the imidazolium ring is sandwiched between benzene molecules through the cation鈭捪€ interaction. Moreover, TFSA鈥?/sup> probably interacts with the imidazolium ring even in the range of xC6H6 鈮?0.9. Thus, the imidazolium rings, benzene molecules, and TFSA鈥?/sup> would form clusters in the C12mim+TFSA鈥?/sup>鈥揵enzene solutions. The LAXS measurements showed that the distance between the imidazolium ring and benzene is 3.8 脜 with that between the benzene molecules of 7.5 脜. On the basis of these results, we discussed a plausible reason for the liquid鈥搇iquid equilibrium of the C12mim+TFSA鈥?/sup>鈥揵enzene system.