Study on the hydrophobicity of [Bmim]2[CuCl4] by two-dimensional correlation spectroscopy

Zhaosheng Fan; Tongguang Xu; Chengyong Jiang; Lida Wang; Suqin Sun; Qun Zhou

doi:10.1016/j.saa.2022.121637

Study on the hydrophobicity of [Bmim]₂[CuCl₄] by two-dimensional correlation spectroscopy

Spectrochim Acta A Mol Biomol Spectrosc. 2022 Dec 5:282:121637. doi: 10.1016/j.saa.2022.121637. Epub 2022 Jul 16.

Authors

Zhaosheng Fan¹, Tongguang Xu², Chengyong Jiang², Lida Wang², Suqin Sun³, Qun Zhou⁴

Affiliations

¹ Technology Center, Shanghai Tobacco Group Beijing Cigarette Factory Co., Ltd., Tongzhou Dis., Beijing 101121, China; Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China.
² Technology Center, Shanghai Tobacco Group Beijing Cigarette Factory Co., Ltd., Tongzhou Dis., Beijing 101121, China.
³ Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China.
⁴ Department of Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China. Electronic address: zhouqun@mail.tsinghua.edu.cn.

PMID: 35907313
DOI: 10.1016/j.saa.2022.121637

Abstract

By dissolving copper chloride in [Bmim]Cl (1-butyl-3-methylimidazolium chloride), chloride ions can coordinate with copper ions and form [CuCl₄]^2-, 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]₂[CuCl₄] and [Bmim]Cl in situ. Hygroscopic capacity and rate of [Bmim]₂[CuCl₄] 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.

Keywords: 2DCOS; FT-IR; Ionic liquid; hydrophobicity.

MeSH terms

Chlorides*
Copper
Hydrophobic and Hydrophilic Interactions
Ionic Liquids* / chemistry
Spectrum Analysis
Water

Substances

Chlorides
Ionic Liquids
Water
Copper