Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 9, Pages 2854-2864Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp810637d
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Funding
- DFG [STE 620/7-2, WA 1615/8-2]
- Excellence Cluster Engineering of Advanced Materials
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Angle resolved X-ray photoelectron spectroscopy has been used to study the surface composition of various nonfunctionalized and functionalized 1,3-dialkylimidazolium ionic liquids. For [C(n)C(1)Im][Tf2N] (where n = 2-16), an enrichment of the aliphatic carbon was observed for longer chains (n >= 4). Enrichment of the aliphatic carbon also occurs for alkyl chains attached to the anion, as observed for [C2C1IM][OcOSO(3)]. Oligo(ethyleneglycol)ether (PEG) functionalities in the cation lead to a surface composition close to bulk stoichiometry and thus a loss in enrichment of the chains. This effect is attributed to attractive interactions between the oxygen atoms on the cation to the hydrogen atoms on the imidazolium ring for [Et(EG)(2)MIm][Tf2N] and [Me(EG)(3)MIm][Tf2N].
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