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Issue 10, 2014
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Predicting the hygroscopicity of imidazolium-based ILs varying in anion by hydrogen-bonding basicity and acidity

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Abstract

Most of ILs are hygroscopic. Hygroscopicity of ILs has a significant influence on the structure and properties of ILs. There should be correlation between hygroscopicity and the other properties of ILs. In this study, eight imidazolium-based ILs varying in anion were used to investigate the relationship between their hygroscopicity parameters (experimental water sorption capacity within 3 h W3h, saturated water sorption capacity W derived from the modified two-step model, degree of difficulty to reach sorption equilibrium 1/k, and water sorption rate kW derived from the modified two step model) and their property parameters (electric field ΔE, polarity ENT, hydrogen-bonding acidity α, hydrogen-bonding basicity β, dipolarity-polarizability π*, and the difference between hydrogen-bonding basicity and acidity βα). We found that βα had a very strong positive correlation coefficient ρ ≈ 0.99 with the hygroscopicity parameters. However, the respective species, i.e., β and α are less correlated with hygroscopicity. The ENT and ΔE are much less correlated with the hygroscopicity of ILs than those of β − α, β and α, while π* has almost no correlation with hygroscopicity of ILs.

Graphical abstract: Predicting the hygroscopicity of imidazolium-based ILs varying in anion by hydrogen-bonding basicity and acidity

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Publication details

The article was received on 19 Aug 2013, accepted on 05 Nov 2013 and first published on 06 Nov 2013


Article type: Paper
DOI: 10.1039/C3RA44464C
Citation: RSC Adv., 2014,4, 5169-5176
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    Predicting the hygroscopicity of imidazolium-based ILs varying in anion by hydrogen-bonding basicity and acidity

    Y. Cao, Y. Chen, X. Wang and T. Mu, RSC Adv., 2014, 4, 5169
    DOI: 10.1039/C3RA44464C

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