Ultrafast Dynamics in Aromatic Cation Based Ionic Liquids: A Femtosecond Raman-Induced Kerr Effect Spectroscopic Study
Ultrafast Dynamics in Aromatic Cation Based Ionic Liquids: A Femtosecond Raman-Induced Kerr Effect Spectroscopic Study
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DOI：
10.1246/bcsj.20160085
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发表时间：
2016-06
影响因子：
4
通讯作者：
H. Shirota;Shohei Kakinuma;Kotaro Takahashi;A. Tago;H. Jeong;T. Fujisawa
中科院分区：
文献类型：
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作者：
H. Shirota;Shohei Kakinuma;Kotaro Takahashi;A. Tago;H. Jeong;T. Fujisawa
我们通过飞秒拉曼诱导克尔效应光谱研究了 40 种基于芳香族阳离子的离子液体 (IL) 的超快动力学。 IL 的低频克尔谱（约 0.3–700 cm−1）是通过傅里叶变换反卷积分析从克尔瞬态获得的。频率范围小于 200 cm−1 的低频克尔谱主要来自离子液体的分子间振动，我们从以下方面进行了讨论：(i) 阴离子依赖性，(ii) 咪唑鎓阳离子与吡啶鎓阳离子，(iii) 烷基依赖性，以及 (iv) 芳香族阳离子甲基化的影响。本研究还估计了当前样品离子液体在 293 K 下的几种液体特性，例如密度、粘度、电导率和表面张力。我们阐明，基于芳香族阳离子的离子液体表现出低频谱带的一阶矩与本体液体参数的不同关系，该参数是表面张力除以液体密度的平方根，与非质子传递函数...
We studied the ultrafast dynamics of 40 aromatic cation based ionic liquids (ILs) by means of femtosecond Raman-induced Kerr effect spectroscopy. The low-frequency Kerr spectra (ca. 0.3–700 cm−1) of the ILs were obtained from the Kerr transients by Fourier-transform deconvolution analysis. The low-frequency Kerr spectra in the frequency range less than 200 cm−1 coming mainly from the intermolecular vibrations for the ILs were discussed in terms of (i) anion dependence, (ii) imidazolium cations vs. pyridinium cations, (iii) alkyl group dependence, and (iv) effect of methylation in aromatic cations. Several liquid properties, such as density, viscosity, electrical conductivity, and surface tension, of the present sample ILs at 293 K were also estimated in this study. We clarified that the aromatic cation based ILs show a different relation of the first moment of the low-frequency spectral band to the bulk liquid parameter, which is the square root of surface tension divided by liquid density, from aprotic m...