The Effect of C4H and C5H on the Microstructure of Aqueous Solutions of 1‐Alkyl‐3‐methylimidazolium Tetrafluoroborate Ionic Liquids |
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Authors: | Dr Yingjie Xu Prof Haoran Li |
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Institution: | 1. Department of Chemistry, Shaoxing University, Huancheng West Road 508, Shaoxing (China);2. Department of Chemistry, Zhejiang University, Zheda Road 38, Hangzhou (China) |
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Abstract: | As is well‐known, the C2?H proton of 1‐ethyl‐3‐methylimidazolium tetrafluoroborate (Emim]BF4) and 1‐butyl‐3‐methylimidazolium tetrafluoroborate (Bmim]BF4) has a strong ability to form hydrogen bonds. The purpose of this work is to evaluate the effect of the interactions of the C4?H and C5?H protons on the microstructure of Emim]BF4 and Bmim]BF4 with water by using 1H NMR spectroscopy. The differences between the relative 1H NMR chemical shifts of C2?H, C4?H, and C5?H and between the interaction‐energy parameters obtained from these chemical shifts are minor, thus suggesting that the interactions of C4?H and C5?H may have a considerable effect on the microstructure. To confirm this, the viscosities of the systems are estimated by using the interaction‐energy parameters obtained from the 1H NMR chemical shifts of the three studied aromatic protons and water, showing that the interactions of C4?H and C5?H also play an important role in the microstructure. |
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Keywords: | ionic liquids local composition model microstructure NMR spectroscopy viscosity |
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