Issue 30, 2013
From the journal:

Physical Chemistry Chemical Physics

Specific interactions between the quaternary ammonium oligoether-based ionic liquid and water as a function of pressure

Hai-Chou Chang,*a   Jyh-Chiang Jiang,*b   Tsai-Yi Chen,a   Hsing-Sheng Wang,a   Leo Yuxiu Li,a   Wei-Wen Hunga  and  Sheng Hsien Linc  

* Corresponding authors

a Department of Chemistry, National Dong Hwa University, Shoufeng, Hualien 974, Taiwan
E-mail: hcchang@mail.ndhu.edu.tw

b Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
E-mail: jcjiang@mail.ntust.edu.tw

c Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan

Abstract

The interactions between Ammoeng 100 and water are probed using high-pressure infrared measurements and DFT-calculations. The results of infrared absorption profiles suggest that the energetically favored approach for water molecules to interact with Ammoeng 100 is via the formation of anion–water interactions, whereas the alkyl C–H groups play much less important roles. After comparison with pure Ammoeng 100, it appears that no appreciable changes in band frequencies of alkyl C–H vibrations occurred as Ammoeng 100 was mixed with D2O. The presence of D2O has a red-shift effect on the peak frequency of the S[double bond, length as m-dash]O stretching vibration under the pressures below 1 GPa in comparison to the absorption frequencies of pure Ammoeng 100. This observation is likely related to local structures of the S[double bond, length as m-dash]O groups interacting with D2O molecules. DFT-calculations indicate that the most energetically favored conformation of ion pairs should be the species having only one hydrophilic hydrogen bonding. The results of calculations reveal that water addition may induce the partial replacement of C–H⋯O interactions with strong hydrogen bonding between anions and water molecules.

Graphical abstract: Specific interactions between the quaternary ammonium oligoether-based ionic liquid and water as a function of pressure

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Article information

DOI
https://doi.org/10.1039/C3CP51396C
Article type
Paper
Submitted
03 Apr 2013
Accepted
30 May 2013
First published
30 May 2013

Phys. Chem. Chem. Phys., 2013,15, 12734-12741

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Specific interactions between the quaternary ammonium oligoether-based ionic liquid and water as a function of pressure

H. Chang, J. Jiang, T. Chen, H. Wang, L. Y. Li, W. Hung and S. H. Lin, Phys. Chem. Chem. Phys., 2013, 15, 12734 DOI: 10.1039/C3CP51396C

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