超快的振动动态和能量转移在伊米达离子液体中
Mahesh Namboodiri1, Mehdi Mohammad Kazemi, Tahir Zeb Khan
1Center for Functional Materials and Nanomolecular Science, Jacobs University , Campus Ring 1, D-28759 Bremen, Germany.
Journal of the American Chemical Society
|April 5, 2014
概括
在C2位置的伊米达离子液体的甲基化显著影响振动脱相动力学,而链长度的影响很小. 这项研究探测了由内电相互作用影响的振动能量转移.
科学领域:
- 物理化学 物理化学
- 频谱学是一种光谱学.
- 材料科学 材料科学 材料科学
背景情况:
- 离子液体 (ILs) 是具有调节性质的多功能溶剂.
- 了解它们的振动动态对于预测它们的行为至关重要.
- 五秒时间解析的连贯反斯托克斯拉曼散射 (CARS) 提供了对超快分子过程的洞察力.
研究的目的:
- 研究C2甲基化对室温离子液体振动脱相时间的影响.
- 阐明内部相互作用在ILs内的振动能量转移中的作用.
- 为了区分离子结构与基链长度对IL振动动态的影响.
主要方法:
- 五秒钟时间分辨率连贯反斯托克斯拉曼散射 (CARS) 光谱.
- 拉曼连贯性的激发在1400厘米左右.
- 随着时间的推移,监测指纹区域中各种1,3-dialkylimidazolium bis(trifluoromethylsulfonyl) imide ([NTf2]) ILs.的振动脱相.
主要成果:
- 的C2甲基化导致振动脱相行为的系统差异.
- 模式跳动涉及超出直接激发光谱的振动,这表明内部相互作用控制能量传输.
- 阳离子上基侧链的长度对振动动力学影响微不足道.
结论:
- 内部相互作用在这些离子液体中的振动能量转移中起着主导作用.
- C2甲基化是影响振动脱相的一个关键因素,比基链长度更重要.
- 五秒汽车在探测离子液体中超快的振动动态和内部离子合方面是有效的.
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