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Issue 12, 2017
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Temperature effects on the viscosity and the wavelength-dependent refractive index of imidazolium-based ionic liquids with a phosphorus-containing anion

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Abstract

A systematic study on the viscosity and refractive index of 1-alkyl-3-methylimidazolium based ionic liquids (alkyl = methyl, butyl and hexyl) combined with three phosphorus containing anions, i.e. dimethylphosphate, methyl methylphosphonate and methylphosphonate, is reported. Experimental measurements account for temperature effects, while the refractive index is determined at multiple wavelengths in the visible and near infrared region. Despite the structural similarity of these anions, significant differences in the physical properties of the resulting ILs are identified, along with the clear trend of viscosity increase – and refractive index decrease – with increasing alkyl chain length on the cation. Ab initio theoretical calculations are carried out to support and rationalise the observed behaviour.

Graphical abstract: Temperature effects on the viscosity and the wavelength-dependent refractive index of imidazolium-based ionic liquids with a phosphorus-containing anion

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Publication details

The article was received on 30 Dec 2016, accepted on 15 Feb 2017 and first published on 06 Mar 2017


Article type: Paper
DOI: 10.1039/C6CP08910K
Citation: Phys. Chem. Chem. Phys., 2017,19, 8201-8209
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    Temperature effects on the viscosity and the wavelength-dependent refractive index of imidazolium-based ionic liquids with a phosphorus-containing anion

    C. Chiappe, P. Margari, A. Mezzetta, C. S. Pomelli, S. Koutsoumpos, M. Papamichael, P. Giannios and K. Moutzouris, Phys. Chem. Chem. Phys., 2017, 19, 8201
    DOI: 10.1039/C6CP08910K

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