Issue 32, 2022

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

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.

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

Supplementary files

Article information

Article type
Edge Article
Submitted
01 Jūn. 2022
Accepted
02 Jūl. 2022
First published
03 Aug. 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 9176-9190

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

F. Philippi, D. Rauber, O. Palumbo, K. Goloviznina, J. McDaniel, D. Pugh, S. Suarez, C. C. Fraenza, A. Padua, C. W. M. Kay and T. Welton, Chem. Sci., 2022, 13, 9176 DOI: 10.1039/D2SC03074H

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