Protic ionic liquids based on the dimeric and oligomeric anions: [(AcO)xHx−1]−

Johansson, K. M., Izgorodina, E. I., Forsyth, M., MacFarlane, D. R. and Seddon, K. R. 2008, Protic ionic liquids based on the dimeric and oligomeric anions: [(AcO)xHx−1]−, Physical chemistry chemical physics, vol. 10, no. 20, pp. 2972-2978, doi: 10.1039/B801405A.

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Title Protic ionic liquids based on the dimeric and oligomeric anions: [(AcO)xHx−1]−
Formatted title Protic ionic liquids based on the dimeric and oligomeric anions: [(AcO)xHx−1]
Author(s) Johansson, K. M.
Izgorodina, E. I.
Forsyth, M.ORCID iD for Forsyth, M.
MacFarlane, D. R.
Seddon, K. R.
Journal name Physical chemistry chemical physics
Volume number 10
Issue number 20
Start page 2972
End page 2978
Total pages 7
Publisher Royal Society of Chemistry
Place of publication Cambridge, England
Publication date 2008
ISSN 1463-9076
Summary We describe a fluidity and conductivity study as a function of composition in N-methylpyrrolidine–acetic acid mixtures. The simple 1:1 acid–base mixture appears to form an ionic liquid, but its degree of ionicity is quite low and such liquids are better thought of as poorly dissociated mixtures of acid and base. The composition consisting of 3 moles acetic acid and 1 mole N-methylpyrrolidine is shown to form the highest ionicity mixture in this binary due to the presence of oligomeric anionic species [(AcO)xHx−1]− stabilised by hydrogen bonds. These oligomeric species, being weaker bases than the acetate anion, shift the proton transfer equilibrium towards formation of ionic species, thus generating a higher degree of ionicity than is present at the 1:1 composition. A Walden plot analysis, thermogravimetric behaviour and proton NMR data, as well as ab initio calculations of the oligomeric species, all support this conclusion.
Language eng
DOI 10.1039/B801405A
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, Owner Societies
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