Investigation on Aggregate Formation of Ionic Liquids

Dorbritz, Sandra; Ruth, Wolfgang; Kragl, Udo

doi:10.1002/adsc.200404352

Cited by 156 publications

(143 citation statements)

References 18 publications

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“…A range of models have been used to describe IL bulk structure, including ion pairs, [3][4][5][6] hydrogen-bonded networks, [7][8][9][10][11][12][13][14][15][16] ion clusters, [17][18][19] and self-assembled nanoscale structuring. 1,[20][21][22][23][24][25][26][27][28][29] The most appropriate model is strongly related to the type of IL under study, as there are many distinct classes.…”

Section: Introductionmentioning

confidence: 99%

Exploring the bulk-phase structure of ionic liquid mixtures using small-angle neutron scattering

et al. 2018

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ReuseItems deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available.You can find more information about Accepted Manuscripts in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal's standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. Accepted Manuscript Faraday Discussions www.rsc.org/faraday_d Faraday Discussions Royal Society of ChemistryThis manuscript will be presented and discussed at a forthcoming Faraday Discussion meeting. All delegates can contribute to the discussion which will be included in the final volume.Register now to attend! Full details of all upcoming meetings: http://rsc.li/fd-upcoming-meetings This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available.You can find more information about Accepted Manuscripts in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal's standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains....

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Section: Introductionmentioning

confidence: 99%

Exploring the bulk-phase structure of ionic liquid mixtures using small-angle neutron scattering

et al. 2018

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“…In water or methanol the observed aggregates are smaller. [47] 3. Charged ILs Clusters and Triple Ions Detected by ESI-MS Triple ions and larger ionic (cationic and anionic) clusters of imidazolium ILs are commonly detected by ESI-MS experiments.…”

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confidence: 99%

Imidazolium Salt Ion Pairs in Solution

Stassen

Ludwig

Wulf

et al. 2015

Chemistry A European J

168

151

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The formation, stabilisation and reactivity of contact ion pairs of non-protic imidazolium ionic liquids (ILs) in solution are conceptualized in light of selected experimental evidence as well theoretical calculations reported mainly in the last ten years. Electric conductivity, NMR, ESI-MS and IR data as well as theoretical calculations support not only the formation of contact ion pairs in solution, but also the presence of larger ionic and neutral aggregates even when dissolved in solvents with relatively high dielectric constants, such as acetonitrile and DMSO. The presence of larger imidazolium supramolecular aggregates is favoured at higher salt concentrations in solvents of low dielectric constant for ILs that contain shorter N-alkyl side chains associated with anions of low coordination ability. The stability and reactivity of neutral contact species are also dependent on the nature of the anion, imidazolium substituents, and are more abundant in ILs containing strong coordinating anions, in particular those that can form charge transfer complexes with the imidazolium cation. Finally, some ILs display reactivities as contact ion pairs rather than solvent-separated ions.

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“…Among reported studies dealing with this topic, most are theoretical studies in which the ion pair interactions are calculated by molecular modelling. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Experimental investigations have been published on mass spectrometric analyses [17,18] and the investigation of physico-chemical properties of either ionic liquid mixtures [19] or solutions of polar molecules in ionic liquids. [20] Most recent publications on the topic have focussed on NMR spectroscopy, [21][22][23][24][25] FT-IR and Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Chirality Transfer in Imidazolium Camphorsulfonate Ionic Liquids through Ion Pairing Effects

et al. 2009

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The paper describes our studies on ion pair interactions in ionic liquids (IL) using an asymmetric hydrogenation reaction as probe. Three different ionic liquids carrying prochiral keto-functionalized cations were hydrogenated in the presence of their chiral, enantiomerically pure counter-ion using an achiral heterogeneous ruthenium catalyst. For the hydrogenation of N-(3'-oxobutyl)-N-methylimidazolium camphorsulfonate (2), N-(3'-oxobutyl)imidazolium camphorsulfonate (4) and N-(5'-oxohexyl)-Nmethylimidazolium camphorsulfonate (6) we found a strong dependency of the enantiomeric excess (ee in the cation) on the polarity of the solvent, the concentration of the IL and the structure of the IL. The highest ee values of up to 94% were found for the hydrogenation of 2 in ethanol. Interestingly, we observed that the ee (and consequently the strength of ion pair interaction) had a pronounced maximum for a certain concentration of the IL in the solvent depending on the nature of the solvent and on the substrate. Remarkably, the concentration leading to the maximum ee could be rationalized by independent determination of the degree of dissociation which was obtained by a combination of diffusion-ordered NMR spectroscopy and conductivity measurements.

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Investigation on Aggregate Formation of Ionic Liquids

Cited by 156 publications

References 18 publications

Exploring the bulk-phase structure of ionic liquid mixtures using small-angle neutron scattering

Exploring the bulk-phase structure of ionic liquid mixtures using small-angle neutron scattering

Imidazolium Salt Ion Pairs in Solution

Chirality Transfer in Imidazolium Camphorsulfonate Ionic Liquids through Ion Pairing Effects

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