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231223s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la104719v
|2 doi
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|a eng
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| 100 |
1 |
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|a Shi, Lijuan
|e verfasserin
|4 aut
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|a Aggregation behavior of long-chain N-aryl imidazolium bromide in aqueous solution
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|c 2011
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|a Text
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|a ƒaComputermedien
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|a Date Completed 07.06.2011
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|a Date Revised 22.02.2011
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The aggregation behavior of three long-chain N-aryl imidazolium ionic liquids (ILs), 1-(2,4,6-trimethylphenyl)-3-alkylimidazolium bromide [C(n)pim]Br (n = 10, 12, and 14), in aqueous solutions was systematically explored by surface tension, electrical conductivity, and (1)H NMR. A lower critical micelle concentration (cmc) for the N-aryl imidazolium ILs is observed compared with that for 1,3-dialkylimidazolium ILs [C(n)mim]Br, indicating that the incorporation of the 2,4,6-trimethylphenyl group into a headgroup favors micellization. The enhanced π-π interactions among the adjacent 2,4,6-trimethylphenyl groups weaken the steric hindrance of headgroups and thus lead to a dense arrangement of [C(n)pim]Br molecules at the air-water interface. An analysis of the (1)H NMR spectra revealed that the introduced 2,4,6-trimethylphenyl group may slightly bend into the hydrophobic regions upon micellization. The micelle formation process for [C(n)pim]Br (n = 10, 12, and 14) was found to be enthalpy-driven in the investigated temperature range, which is attributed to the strong electrostatic self-repulsion of the headgroups and the counterions as well as the π-π interactions among headgroups. Strong, stable fluorescence properties are presented by the new N-aryl imidazolium ILs, indicating their potential application in the field of photochemistry
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|a Journal Article
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|a Li, Na
|e verfasserin
|4 aut
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|a Yan, Han
|e verfasserin
|4 aut
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|a Gao, Yan'an
|e verfasserin
|4 aut
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| 700 |
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|a Zheng, Liqiang
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 27(2011), 5 vom: 01. März, Seite 1618-25
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|x 1520-5827
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|g volume:27
|g year:2011
|g number:5
|g day:01
|g month:03
|g pages:1618-25
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|u http://dx.doi.org/10.1021/la104719v
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