期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 115, 期 16, 页码 4621-4631出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp200370f
关键词
-
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [21685001]
- Grants-in-Aid for Scientific Research [21685001, 23550029] Funding Source: KAKEN
We investigated the ultrafast dynamics in 1-butyl-3-methylimidazolium-based ionic liquids with two series of anions, (1) cyano-group substituted anions (thiocyanate [SCN](-), dicyanamide [N(CN)(2)](-), and tricyanomethide [C(CN)(3)](-)) and (2) trifluoromethylsulfonyl-group substituted anions (trifluromethanesulfonate [Otf](-), bis(trifluoromethylsulfonyl)amide [NTf2](-), and tris(trifluoromethylsulfonyl)methide [CTf3](-)). This was done by femtosecond Raman-induced Kerr effect spectoscopy. From the Fourier transform Kerr spectra of the ionic liquids, the low-frequency spectrum of 1-butyl-3-methylimidazolium trianomethide shows a low frequency shift compared to the ILs with the other cyano-group substituted anions due to the planar structures of the cation and the anion the relative amplitude of the low-frequency band at approximately 20 cm(-1) compared to the entire broad spectrum for the ionic liquids with trifluoromethylsulfonyl-group substituted anions becomes larger with the order [OTf](-) < [NTf2](-) approximate to [CTf3](-). This vibrational band can be attributed to the librational motion of anions and/or the coupling of the translational and reorientational motions.
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