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Flexibility is the key to tuning the transport properties of fluorinated imide-based ionic liquids

Philippi, Frederik; Rauber, Daniel; Palumbo, Oriele; Goloviznina, Kateryna; McDaniel, Jesse; Pugh, David; Suarez, Sophia; ... Welton, Tom; + view all (2022) Flexibility is the key to tuning the transport properties of fluorinated imide-based ionic liquids. Chemical Science , 32 (13) pp. 9176-9190. 10.1039/d2sc03074h. Green open access

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Abstract

Ionic liquids are becoming increasingly popular for practical applications such as biomass processing and lithium-ion batteries. However, identifying ionic liquids with optimal properties for specific applications by trial and error is extremely inefficient since there are a vast number of potential candidate ions. Here we combine experimental and computational techniques to determine how the interplay of fluorination, flexibility and mass affects the transport properties of ionic liquids with the popular imide anion. We observe that fluorination and flexibility have a large impact on properties such as viscosity, whereas the influence of mass is negligible. Using targeted modifications, we show that conformational flexibility provides a significant contribution to the success of fluorination as a design element. Contrary to conventional wisdom, fluorination by itself is thus not a guarantor for beneficial properties such as low viscosity.

Type: Article
Title: Flexibility is the key to tuning the transport properties of fluorinated imide-based ionic liquids
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d2sc03074h
Publisher version: https://doi.org/10.1039/d2sc03074h
Language: English
Additional information: © 2022 The Author(s). Published by the Royal Society of Chemistry.This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10153525
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