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Structure effects on the ionicity of protic ionic liquids
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Mann, Sarah K., Brown, Steven P. and MacFarlane, Douglas R. (2020) Structure effects on the ionicity of protic ionic liquids. ChemPhysChem, 21 (13). pp. 1444-1454. doi:10.1002/cphc.202000242 ISSN 1439-4235.
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WRAP-Structure-effects-ionicity-protic-ionic-liquids-Brown-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1840Kb) | Preview |
Official URL: https://doi.org/10.1002/cphc.202000242
Abstract
We report on the characterisation of 16 protic ionic liquids (PILs) prepared by neutralization of primary or tertiary amines with a range of simple carboxylic acids, or salicylic acid. The extent of proton transfer was greater for simple primary amine ILs compared to tertiary amines. For the latter case, proton transfer was increased by providing a better solvation environment for the ions through the addition of a hydroxyl group, either on the tertiary amine, or by formation of PIL/molecular solvent mixtures. The library of PILs was characterised by DSC and a range of transport properties (i.e. viscosity, conductivity and diffusivity) were measured. Using the (fractional) Walden rule, the conductivity and viscosity results were analysed with respect to their deviation from ideal behaviour. The validity of the Walden plot for PILs containing ions of varying sizes was also verified for a number of samples by directly measuring self‐diffusion coefficients using pulsed‐field gradient spin‐echo (PGSE) NMR. Ionicity was found to decrease as the alkyl chain length and degree of branching of both the cations and anions was increased. These results aim to develop a better understanding of the relationship between PIL properties and structure, to help design ILs with optimal properties for applications.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Library of Congress Subject Headings (LCSH): | Ionic solutions , Proton transfer reactions , Viscosity, Amines -- Analysis | ||||||||||||
Journal or Publication Title: | ChemPhysChem | ||||||||||||
Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||||||||||
ISSN: | 1439-4235 | ||||||||||||
Official Date: | 2 July 2020 | ||||||||||||
Dates: |
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Volume: | 21 | ||||||||||||
Number: | 13 | ||||||||||||
Page Range: | pp. 1444-1454 | ||||||||||||
DOI: | 10.1002/cphc.202000242 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Reuse Statement (publisher, data, author rights): | "This is the peer reviewed version of the following article: Mann, S..K., Brown, S..P. and MacFarlane, D.R. (2020), Structure Effects on the Ionicity of Protic Ionic Liquids. ChemPhysChem. Accepted Author Manuscript. , which has been published in final form at https://doi.org/10.1002/cphc.202000242. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions." | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Date of first compliant deposit: | 11 June 2020 | ||||||||||||
Date of first compliant Open Access: | 22 May 2021 | ||||||||||||
RIOXX Funder/Project Grant: |
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