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Issue 28, 2016
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Why are some cyano-based ionic liquids better glucose solvents than water?

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Abstract

Among different classes of ionic liquids (ILs), those with cyano-based anions have been of special interest due to their low viscosity and enhanced solvation ability for a large variety of compounds. Experimental results from this work reveal that the solubility of glucose in some of these ionic liquids may be higher than in water – a well-known solvent with enhanced capacity to dissolve mono- and disaccharides. This raises questions on the ability of cyano groups to establish strong hydrogen bonds with carbohydrates and on the optimal number of cyano groups at the IL anion that maximizes the solubility of glucose. In addition to experimental solubility data, these questions are addressed in this study using a combination of density functional theory (DFT) and molecular dynamics (MD) simulations. Through the calculation of the number of hydrogen bonds, coordination numbers, energies of interaction and radial and spatial distribution functions, it was possible to explain the experimental results and to show that the ability to favorably interact with glucose is driven by the polarity of each IL anion, with the optimal anion being dicyanamide.

Graphical abstract: Why are some cyano-based ionic liquids better glucose solvents than water?

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Publication details

The article was received on 15 Apr 2016, accepted on 14 Jun 2016 and first published on 15 Jun 2016


Article type: Paper
DOI: 10.1039/C6CP02538B
Citation: Phys. Chem. Chem. Phys., 2016,18, 18958-18970
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    Why are some cyano-based ionic liquids better glucose solvents than water?

    M. L. S. Batista, H. Passos, B. J. M. Henriques, E. J. Maginn, S. P. Pinho, M. G. Freire, J. R. B. Gomes and J. A. P. Coutinho, Phys. Chem. Chem. Phys., 2016, 18, 18958
    DOI: 10.1039/C6CP02538B

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