We report colossal conductivities, σdc ∼ 10-1.5·S cm-1, of new dicationic ionic liquids, close to the range of benchmark materials/electrolytes applied in fuel cells and batteries. The new ionic liquids consist of extended viologen bistriflimides containing oligoethyleneoxy groups, were prepared via Zinke reaction under mild conditions, and are excellent candidates as components in devices for energy conversion and storage applications.
We sincerely acknowledge Dr Kousaalya Bakthavatchalam for critically reading and making insightful suggestions for the improvement of the article. TSV acknowledges the Ministry of Higher Education of Malaysia through the Fundamental Research Grant Scheme [FRGS/1/2018/STG07/UM/02/6]. AMF would like to thank the Carnegie Trust for the Universities of Scotland, for the Research Incentive Grant RIG008586, the Royal Society and Specac Ltd., for the Research Grant RGS\R1\201397, the Royal Society of Chemistry for the award of a mobility grant (M19- 0000), and the Scottish Government and the Royal Society of Edinburgh for one SAPPHIRE project. UB thanks the School of Engineering (University of Aberdeen) for the award of one Summer Scholarship.
Data Availability StatementData will be made available on request.
- Extended viologen salts
- Ionic liquids
- Zincke reaction, Differential scanning calorimetry
- Ionic conductivity, Dielectric impedance spectroscopy