Confirmation of local water structure confined in ionic liquids using H/D exchange
Confirmation of local water structure confined in ionic liquids using H/D exchange
复制标题
使用 H/D 交换确认离子液体中限制的局部水结构
DOI：
10.1016/j.molliq.2019.04.151
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发表时间：
2019
影响因子：
6
通讯作者：
A. Shimizu
中科院分区：
文献类型：
--
作者：
Y. Yoshimura;Takahiro Mori;Kazuyoshi Kaneko;Koji Nogami;T. Takekiyo;Y. Masuda;A. Shimizu
利用核磁共振和拉曼光谱研究了1-丁基-3-甲基咪唑四氟硼酸盐(简称[bmim][BF4])离子液体(IL)纳米结构中水分子的局域结构，以监测H2O和D2O之间的H/D交换反应。结果表明，当水的摩尔分数小于60%时，IL纳米空间中的水分子可能少于5个，水分子的平移运动受到抑制，质子交换速率受到很大的限制。这些现象归因于水域中没有大块的氢键网络结构。HDO分子的H原子倾向于与BF4−阴离子相互作用，而HDO分子的D原子倾向于与BMIM+阳离子的C2原子相互作用。结果，水分子被困在IL骨架中，这可能是混合物中水分子之间H/D交换率降低的主要原因。
We investigated the local structure of water molecules confined inside ionic liquid (IL) nanodomain structures of 1-butyl-3-methylimidazolium tetrafluoroborate, (abbreviated as [bmim][BF4]) using NMR and Raman spectroscopy to monitor H/D exchange reaction between H2O and D2O water molecules. The results showed that fewer than 5 water molecules were probably present in the water domain of the IL nanospace at less than ~60 water mol%, where the translational motion of water molecules was inhibited and proton exchange rate was highly restricted. These phenomena were attributed to the absence of bulk hydrogen-bonded network structures in the water domain. The H atoms of the HDO molecule tended to interact with BF4−anions, whereas the D atoms of HDO interacted with the C2 atoms of the bmim+cation. As a result, water molecules became trapped inside the IL framework, which is likely to be the main cause of the reduction in H/D exchange rate among water molecules in the mixture.
锂掺杂质子和非质子离子液体的结构研究
DOI：
10.1021/acs.jpcb.7b02636
发表时间：
2017
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
P. Ray;T. Vogl;A. Balducci;B. Kirchner
通讯作者：
B. Kirchner