<div class="csl-bib-body">
<div class="csl-entry">Friesen, S., Buchecker, T., Cognigni, A., Bica-Schröder, K., & Buchner, R. (2017). Hydration and Counterion Binding of [C12MIM] Micelles. <i>Langmuir</i>. https://doi.org/10.1021/acs.langmuir.7b02201</div>
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The final publication is available via <a href="https://doi.org/10.1021/acs.langmuir.7b02201" target="_blank">https://doi.org/10.1021/acs.langmuir.7b02201</a>.
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dc.description.abstract
Surface-active ionic liquids based on imidazolium cations are promising targets for micellar catalysis in aqueous solution, yielding enhanced rate constants compared to surfactants based on n-alkyltrimethylammonium cations and exhibiting a pronounced counterion dependence (Bica Chem. Commun. 2012, 48, 5013−5015; Cognigni Phys. Chem. Chem. Phys. 2016, 18, 13375–13384). Probably most relevant to these effects is the interplay between headgroup hydration and counterion binding. To obtain more detailed information on these effects, aqueous solutions of 1-dodecyl-3-methylimidazolium ([C12MIM]) bromide, iodide, and triflate (TfO–) were investigated at 45 °C using broadband dielectric spectroscopy, viscosity measurements, and small-angle X-ray scattering experiments. Effective hydration numbers were determined, and information on the locations and mobilities of the condensed counterions, X–, was derived. It was found that [C12MIM] halide micelles were less hydrated than the corresponding n-dodecyltrimethylammonium ([C12TA]X) aggregates. Together with their somewhat weaker counterion condensation, this difference probably explains their higher catalytic activity. Whereas [C12MIM]Br micelles remained roughly spherical in the studied concentration range, rodlike aggregates were formed at high concentrations of the iodide and, in particular, the triflate surfactants. It appears that the much lower mobility of condensed TfO– counterions is the reason for the very low catalytic activity of [C12MIM]TfO micelles.
en
dc.description.sponsorship
Austrian Science Funds (FWF)
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dc.description.sponsorship
COST action , Exchange on Ionic Liquids
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dc.description.sponsorship
DFG Graduate School GRK
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dc.description.sponsorship
Bayerisch-französisches Hochschulzentrum (BFHZ)
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dc.language
English
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dc.language.iso
en
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dc.publisher
American Chemical Society
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dc.relation.ispartof
Langmuir
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.title
Hydration and Counterion Binding of [C12MIM] Micelles
en
dc.type
Article
en
dc.type
Artikel
de
dc.rights.license
Urheberrechtsschutz
de
dc.rights.license
In Copyright
en
dc.contributor.affiliation
Universität Regensburg, Germany
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dc.contributor.affiliation
Universität Regensburg, Germany
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dc.contributor.affiliation
Universität Regensburg, Germany
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dc.relation.grantno
P25504-N28
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dc.relation.grantno
CM1206
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dc.relation.grantno
1626
-
dc.relation.grantno
FK41_15
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dcterms.dateSubmitted
2017-06-29
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dc.rights.holder
2017 American Chemical Society
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dc.type.category
Original Research Article
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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tuw.version
am
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dcterms.isPartOf.title
Langmuir
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tuw.publication.orgunit
E163 - Institut für Angewandte Synthesechemie
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tuw.publisher.doi
10.1021/acs.langmuir.7b02201
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dc.date.onlinefirst
2017-09-05
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dc.identifier.eissn
1520-5827
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dc.identifier.libraryid
AC15058944
-
dc.identifier.urn
urn:nbn:at:at-ubtuw:3-3537
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tuw.author.orcid
0000-0002-2515-9873
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dc.rights.identifier
Urheberrechtsschutz
de
dc.rights.identifier
In Copyright
en
wb.sci
true
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Publications
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item.openairetype
research article
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item.languageiso639-1
en
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item.fulltext
with Fulltext
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item.openaccessfulltext
Open Access
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item.grantfulltext
open
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item.openairecristype
http://purl.org/coar/resource_type/c_2df8fbb1
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crisitem.author.dept
Universität Regensburg, Germany
-
crisitem.author.dept
E163 - Institut für Angewandte Synthesechemie
-
crisitem.author.dept
E163-03-5 - Forschungsgruppe Nachhaltige organische Synthese und Katalyse
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crisitem.author.orcid
0000-0002-2515-9873
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crisitem.author.parentorg
E150 - Fakultät für Technische Chemie
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crisitem.author.parentorg
E163-03 - Forschungsbereich Organische und Biologische Chemie