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Structural features of selected protic ionic liquids based on a super-strong base

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Abstract

Protic ionic liquids (PIL) were prepared from a super-strong base 1,7-diazabicyclo[5.4.0]undec-7-ene (DBU) and super-strong acids, trifluoromethane sulfonic acid (TfOH), and (trifluoromethanesulfonyl)-(nonafluorobutylsulfonyl)imide, (IM14H), ([DBUH][TfO] and [DBUH][IM14], respectively; the latter for the first time) and their chemical and physical properties and structural features have been explored using a synergy of experimental and computational tools. The short range order in neat DBU, as well as the long range structural correlations induced by charge correlation and hydrogen bonding interactions in the ionic liquids, have been explored under ambient conditions, where these compounds are proposed for a variety of applications. Similar to other [DBUH]-based PILs, the probed ones behave as good ionic liquids. Molecular dynamics-rationalised X-ray diffraction patterns show the major role played by hydrogen bonding in affecting morphology in these systems. Additionally, we find further evidence for the existence of fluorous domains in [DBUH][IM14], thus potentially extending the range of applications for these PILs.

Graphical abstract: Structural features of selected protic ionic liquids based on a super-strong base

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Publication details

The article was received on 12 Jul 2019, accepted on 21 Oct 2019 and first published on 22 Oct 2019


Article type: Paper
DOI: 10.1039/C9CP03927A
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Structural features of selected protic ionic liquids based on a super-strong base

    A. Triolo, F. Lo Celso, C. Ottaviani, P. Ji, G. B. Appetecchi, F. Leonelli, D. S. Keeble and O. Russina, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP03927A

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