Issue 38, 2017

A lipophilic ionic liquid based on formamidinium cations and TFSI: the electric response and the effect of CO2 on the conductivity mechanism

Abstract

This work describes the preparation of the new lipophilic ionic liquid tetraoctyl-formamidinium bis(trifluoromethanesulfonyl) imide (TOFATFSI), which is miscible with lower alkanes. In particular, this work focuses on the electric behaviour of TOFATFSI in the particularly challenging highly apolar environment of supercritical CO2. The conductivity and relaxation phenomena are revealed through the analysis of the broadband electric spectra with a particular emphasis on the effect of temperature and CO2 uptake on the IL conductivity. It is found that temperature boosts the conductivity via an increase in the charge carrier mobility. Also, CO2 absorption affects both the conductivity and the permittivity of the material due to the presence of CO2–IL interactions that modulate the nanostructure and the size of the TOFATFSI aggregates, which increases both the mobility and the density of the charge carriers.

Graphical abstract: A lipophilic ionic liquid based on formamidinium cations and TFSI: the electric response and the effect of CO2 on the conductivity mechanism

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2017
Accepted
05 Sep 2017
First published
05 Sep 2017

Phys. Chem. Chem. Phys., 2017,19, 26230-26239

A lipophilic ionic liquid based on formamidinium cations and TFSI: the electric response and the effect of CO2 on the conductivity mechanism

F. Bertasi, G. A. Giffin, K. Vezzù, G. Pace, Y. Abu-Lebdeh, M. Armand and V. Di Noto, Phys. Chem. Chem. Phys., 2017, 19, 26230 DOI: 10.1039/C7CP02304A

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