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Aqueous Brønsted–Lowry Chemistry of Ionic Liquid Ions
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2015 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 16, no 11, 2432-2439 p.Article in journal (Refereed) Published
Abstract [en]

Ionic liquids have become commonplace materials found in research laboratories the world over, and are increasingly utilised in studies featuring water as co-solvent. It is reported herein that proton activities, aH+, originating from auto-protolysis of H2O molecules, are significantly altered in mixtures with common ionic liquids comprised of Cl, [HSO4], [CH3SO4], [CH3COO], [BF4], relative to pure water. paH+ values, recorded in partially aqueous media as −log(aH+), are observed over a wide range (∼0–13) as a result of hydrolysis (or acid dissociation) of liquid salt ions to their associated parent molecules (or conjugate bases). Brønsted–Lowry acid–base character of ionic liquid ions observed is rooted in equilibria known to govern the highly developed aqueous chemistry of classical organic and inorganic salts, as their well-known aqueous pKs dictate. Classical salt behaviour observed for both protic and aprotic ions in the presence of water suggests appropriate attention need be given to relevant chemical systems in order to exploit, or avoid, the nature of the medium formed.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2015. Vol. 16, no 11, 2432-2439 p.
Keyword [en]
acid–base equilibria, acid dissociation, aqueous solutions, ionic liquids, proton activities
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-106752DOI: 10.1002/cphc.201500148ISI: 000358538300021PubMedID: 26097128OAI: oai:DiVA.org:umu-106752DiVA: diva2:844555
Available from: 2015-08-06 Created: 2015-08-06 Last updated: 2017-12-04Bibliographically approved

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