In situ monitoring the moisture absorption of three ionic liquids with different halogen anions by ATR-FTIR spectroscopy

被引：8
作者：
Fan, Zhaosheng [1 ]
Chen, Jianbo [2 ]
Guo, Wenji [1 ]
Ma, Fang [1 ]
Sun, Suqin [1 ]
Zhou, Qun [1 ]
机构：
[1] Tsinghua Univ, Dept Chem, Key Lab Bioorgan Phosphorus Chem & Chem Biol, Minist Educ, Beijing 100084, Peoples R China
[2] Beijing Univ Chinese Med, Sch Life Sci, Beijing 100029, Peoples R China
来源：
JOURNAL OF MOLECULAR STRUCTURE | 2018年 / 1164卷
基金：
中国国家自然科学基金;
关键词：
Ionic liquid; Halogen anion; Moisture absorption; Hydrogen bond; 2D-IR; 1-ETHYL-3-METHYLIMIDAZOLIUM ETHYL SULFATE; 2-DIMENSIONAL CORRELATION SPECTROSCOPY; VIBRATIONAL-SPECTRA; MOLECULAR-STRUCTURE; AB-INITIO; CELLULOSE; WATER; RAMAN; DISSOLUTION; PAIR;
D O I：
10.1016/j.molstruc.2018.03.043
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ionic liquid is a promising cellulose solvent in the future, while moisture absorption hinders the cellulose dissolution. In the present work, we in situ monitored the procedure of moisture absorption of three 1-butyl-3-methylimidazolium cation based ionic liquids with variation of halogen anions. According to the peak position shifts across the moisture absorption process, we analyzed the structure variation of ionic liquids during the process. Besides, we analyzed the hydrogen bond interaction between halogen anion and imidazolium cation C-Hs, including ring C-Hs and side alkyl chain C-Hs, based on infrared absorption bands position shifts of the three ionic liquids. In addition, two dimensional correlation spectroscopy was applied to enhance the spectra resolution, unveiling the transformation of ionic liquids after absorbing moisture for the split of peak attributed to ring C2-H stretching. In summary, we provide reliable evidence to analyze the structure variation of ionic liquid during moisture absorption process and hydrogen bond interaction of halogen anion with imidazolium cation ring/side alkyl C-Hs from the perspective of infrared spectroscopy. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：297 / 302
页数：6
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