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Protic Ionic Liquids Can Be Both Free Proton Conductors and Benign Superacids.pdf (661.15 kB)

Protic Ionic Liquids Can Be Both Free Proton Conductors and Benign Superacids .

preprint
submitted on 17.11.2020, 23:03 and posted on 18.11.2020, 12:46 by younes ansari, kazuhide ueno, Austen Angell
Superacids have been the source of much spectacular chemistry, but very little interesting physics despite the fact that the states of cations formed by transfer of the superacid proton to molecular bases, can approach that of the cations in free space. Indeed some of the very strongest acids, such as HPF6 and HAlCl4, have no independent existence due to lack of screening of the bare proton self-energy: their acidities can only be assessed by study of the conjugate bases. Here we show that, by allowing the protons of transient HAlCl4 and HAlBr4 to relocate on pentafluoropyridine, PFP - a very weak base that is stable to superacids - we can create glassforming protic ionic liquids (PILs) which are themselves superacids but, being free of superacid vapors, are of benign character. At Tg, conductivities exceed “good” ionic liquid values by 9 decades, so must be superprotonic. Anomalous Walden plots confirm superprotonicity.

Funding

DOD Army Research Office, Grant nos. W911-NF07-10423, W911NF0710423 and W911-NF19-10152

History

Email Address of Submitting Author

austenangell@gmail.com

Institution

Arizona State University

Country

United States

ORCID For Submitting Author

0000-0002-8485-1480

Declaration of Conflict of Interest

None

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