By dissolving copper chloride in [Bmim]Cl (1-butyl-3-methylimidazolium chloride), chloride ions can coordinate with copper ions and form [CuCl], thereby inducing the solution being hydrophobic. In the present work, hydrogen bonds between [Bmim] and anions are analyzed and discussed by two-dimensional correlation spectroscopy. Time-dependent attenuated total reflection spectroscopy (ATR-FTIR) is introduced to monitor the hygroscopic process of [Bmim][CuCl] and [Bmim]Cl in situ. Hygroscopic capacity and rate of [Bmim][CuCl] shrink compared with [Bmim]Cl. The change of water molecular clusters has been studied by second-derivative spectra in the hygroscopic process. The behaviors of water molecular in the two ionic liquids are also distinctive.
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| http://dx.doi.org/10.1016/j.saa.2022.121637 | DOI Listing |
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