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The Effect of C4H and C5H on the Microstructure of Aqueous Solutions of 1‐Alkyl‐3‐methylimidazolium Tetrafluoroborate Ionic Liquids
Author(s) -
Xu Yingjie,
Li Haoran
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500381
Subject(s) - ionic liquid , tetrafluoroborate , microstructure , hydrogen bond , chemistry , aqueous solution , alkyl , proton nmr , chemical shift , nuclear magnetic resonance spectroscopy , proton , ionic bonding , crystallography , inorganic chemistry , molecule , organic chemistry , ion , physics , catalysis , quantum mechanics
As is well‐known, the C2H proton of 1‐ethyl‐3‐methylimidazolium tetrafluoroborate ([Emim]BF 4 ) and 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) has a strong ability to form hydrogen bonds. The purpose of this work is to evaluate the effect of the interactions of the C4H and C5H protons on the microstructure of [Emim]BF 4 and [Bmim]BF 4 with water by using 1 H NMR spectroscopy. The differences between the relative 1 H NMR chemical shifts of C2H, C4H, and C5H and between the interaction‐energy parameters obtained from these chemical shifts are minor, thus suggesting that the interactions of C4H and C5H 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 1 H NMR chemical shifts of the three studied aromatic protons and water, showing that the interactions of C4H and C5H also play an important role in the microstructure.