Issue 7, 2013
From the journal:

New Journal of Chemistry

Water sorption in protic ionic liquids: correlation between hygroscopicity and polarity

Yu Chen,a   Yuanyuan Cao,a   Xunyu Lu,b   Chuan Zhao,b   Chuanyu Yana  and  Tiancheng Mu*a  

* Corresponding authors

a Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China
E-mail: tcmu@chem.ruc.edu.cn
Fax: +86-10-62516444
Tel: +86-10-62514925

b School of Chemistry, The University of New South Wales, NSW 2052, Australia

Abstract

The hygroscopicity of nine protic ionic liquids (PILs) was first measured in air for 24 h at ambient temperature (ave. 28.9 °C) and relative humidity (ave. 56.6%). The hygroscopic process was qualitatively described by a sorption triangle, which connects well the three types of water sorption parameters, i.e., sorption capacity (C, W24h, W∞), sorption rate (R, kW∞, 1/t0.01, R30min), and sorption equilibrium (E, 1/k). Then, the hydrophilicity of the PILs was derived by the steady-state sorption capacity 100W∞. The results show that PILs are highly hygroscopic and have greater hydrophilicity compared to aprotic ionic liquids. Finally, the polarity of the PILs was indicated by Nile Red with λmax and was found to be positively correlated with their hygroscopicity capacity (W24h, W∞) and initial rate (R30min), while being negatively correlated with the average equilibrium (1/k), average rate (kW∞, 1/t0.01) and OH asymmetric stretching modes of water (νOH) in PILs. The results show that the correlation between the hygroscopicity and polarity of PILs is complicated.

Graphical abstract: Water sorption in protic ionic liquids: correlation between hygroscopicity and polarity

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Article information

DOI
https://doi.org/10.1039/C3NJ00213F
Article type
Paper
Submitted
25 Feb 2013
Accepted
20 Mar 2013
First published
22 Mar 2013

New J. Chem., 2013,37, 1959-1967

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Water sorption in protic ionic liquids: correlation between hygroscopicity and polarity

Y. Chen, Y. Cao, X. Lu, C. Zhao, C. Yan and T. Mu, New J. Chem., 2013, 37, 1959 DOI: 10.1039/C3NJ00213F

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