中文摘要：

利用衰减全反射红外光谱(ATR-IR)和二维相关红外技术研究2,6-二甲氧基苯酚(2,6-DMP)在1-丁基-3-甲基咪唑四氟硼酸盐([C4mim]BF4)水溶液(离子液体摩尔分数xIL=1.0~0.02)中的溶解行为。随着水量增大,2,6-DMP溶解度先增大而后急剧减小,对应的xIL阈值为0.1。2,6-DMP与[C4mim]BF4之间存在强相互作用,2,6-DMP上的甲氧基是重要作用位点之一;当少量的水加入[C4mim]BF4(xIL=0.1~1.0),致密的离子簇结构被解离,2,6-DMP容易与[C4mim]BF4作用,溶解度增大;随着大量水加入(0.02

英文摘要：

Dissolution behavior of 2,6-dimethoxyphenol (2,6-DMP) in 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim]BF4) aqueous solutions (ionic liquid mole fractionxIL=1.0-0.02) was investigated by attenuated total reflectance infrared (ATR-IR) spectroscopy and two-dimensional correlation IR spectroscopy. The results indicated that 2, 6-DMP solubility increases and then dramatically decreases with increasing amount of water added into [C4mim]BF4. The corresponding threshold ofxIL is 0.1. There is a strong interaction between 2,6-DMP and [C4mim]BF4, and the methoxyl group of 2,6-DMP is one of main active sites. In the case of adding small amount of water into [C4mim]BF4 (xIL=0.1-1.0), compact ionic clusters of [C4mim]BF4could be dissociated. 2,6-DMP is easy to interact with [C4mim]BF4, which results in the increase of its solubility. In the case of adding a large amount of water into [C4mim]BF4 (xIL=0.02-0.1), the ionic clusters are completely dissociated into ionic pairs surrounded by large molecular water clusters. The interactions between hydrophobic2,6-DMP and [C4mim]BF4become difficult, and the 2,6-DMP solubility decreases. This transformation of microstructure withwater addition influences the 2,6-DMP dissolution.