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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Trace of the Interesting 'V'-Shaped Dynamic Mechanism of Interactions between Water and Ionic Liquids
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Trace of the Interesting 'V'-Shaped Dynamic Mechanism of Interactions between Water and Ionic Liquids

机译：水与离子液体相互作用的有趣的“ V”形动力学机理的痕迹

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The mixture of ionic liquid (1-butyl-3-memylirnidazolium tetrafluoroborate, bmirnBF4) and water (2.5%, molar fraction) under isothermal conditions at 80 °C was investigated by FTIR spectroscopy and two-dimensional correlation infrared spectroscopy (2D-IR) methods. Three regions were focused: the OH stretching band of water (3755—3300 cm~(-1)), the stretching band of CH on the imidazole ring (3300—3020 cm~(-1)), and the BF stretching band of anions (1310—1260 cm~(-1)). During this process, water was gradually evaporated as time passed, which produced influences on the interactions among cations, anions, and water molecules. In the FTIR analysis, we found an interesting "V"-shaped changing trend in peak areas of the C—H on the imidazole ring and the B—F stretching band; the inflection of the system was 913 s, gained through the "moving window" method. A two-step variation was accordingly found during this process. Hydrogen bonds formed by water molecules with cations or water molecules with anions were destroyed by the reduction of water, making a fall in the former period of "V" process, while electrostatic interactions newly formed between anions and cations leading to a rise during the latter period of this course. In this paper, various conformations formed among cations, anions, and water molecules were clearly assigned, and we managed to trace the whole dynamic mechanism of this isothermal process by 2D-IR techniques.
机译：通过FTIR光谱和二维相关红外光谱（2D-IR）研究了在80°C等温条件下离子液体（1-丁基-3-甲基咪唑鎓四氟硼酸酯，bmirnBF4）和水（2.5％，摩尔分数）的混合物方法。重点关注三个区域：水的OH拉伸带（3755-3300 cm〜（-1）），咪唑环上CH的拉伸带（3300-3020 cm〜（-1））和BF的拉伸带。阴离子（1310-1260 cm〜（-1））。在此过程中，随着时间的流逝，水逐渐蒸发，这对阳离子，阴离子和水分子之间的相互作用产生了影响。在FTIR分析中，我们发现咪唑环上的CH峰和BF拉伸带的峰面积出现了一个有趣的“ V”形变化趋势。通过“移动窗口”方法获得的系统变化为913 s。因此，在此过程中发现了两步变化。水的还原会破坏由带阳离子的水分子或带阴离子的水分子形成的氢键，从而使“ V”过程的前一个阶段下降，而在阴离子和阳离子之间新形成的静电相互作用导致后者的上升。本课程的期间。在本文中，明确分配了在阳离子，阴离子和水分子之间形成的各种构象，并通过2D-IR技术设法追踪了此等温过程的整个动力学机理。

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