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Probing Molecular Interactions in 1-Butyl-3-methylimidazolium Chloride-Water and 2,6-Dimethoxyphenol Mixtures Using Attenuated Total Reflection Infrared Spectroscopy
Yan-tao Wang1,2,3,4, Kun-lan Li1, Li-gang Wei1, Ying-chong Ma1
1.School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China;2.Laboratory of EA4297 TIMR, University of Technology of Compiè3.gne, Compiè4.gne 60200, France
Abstract:
Molecular interactions of the ternary mixtures of 1-butyl-3-methylimidazolium chloride ([C4C1im]Cl)-water-2,6-dimethoxyphenol (2,6-DMP, a phenolic monomer lignin model compound) were investigated in comparison with the [C4C1im]Cl-water binary systems through attenuated total reflection infrared spectroscopy. Results indicated that the microstructures of water and [C4C1im]Cl changed with varying mole fraction of [C4C1im]Cl (xIL) from 0.01 to 1.0. This change was mainly attributed to the interactions of [C4C1im]Cl-water and the self-aggregation of [C4C1im]Cl through hydrogen bonding. The band shifts of C-H on imidazolium ring and the functional groups in 2,6-DMP indicated that the occurrence of intermolecular interactions by different mechanisms (i.e., hydrogen bonding or π-π stacking) resulted in 2,6-DMP dissolution. In the case of xIL=0.12, the slightly hydrogen-bonded water was fully destroyed and [C4C1im]Cl existed in the form of hydrated ion pairs. Interestingly, the maximum 2,6-DMP solubility (238.5 g/100 g) was achieved in this case. The interactions and microstructures of [C4C1im]Cl-water mixtures influenced the dissolution behavior of 2,6-DMP.
Key words:  Lignin model compound  Ionic liquid-water  Molecular interactions
FundProject:This work was supported by the National Natural Science Foundation of China (No.21106011 and No.21276034) and the Program of Science and Technology of Liaoning Province (No.201602058), and China Scholarship Council.
1-丁基-3-甲基咪唑氯盐-水和2,6-二甲氧基苯酚混合物中分子相互作用的衰减全反射红外光谱研究
王艳涛,李坤兰,魏立纲,马英冲
1.大连工业大学轻工与化学工程学院, 大连 116034;2.贡比涅技术大学可再生资源综合利用实验室, 贡比涅 60200
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DOI:10.1063/1674-0068/30/cjcp1611203
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