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Influence of Different Substituents on the Surface Composition of Ionic Liquids Studied Using ARXPS

Lovelock, KRJ; Kolbeck, C; Cremer, T; Paape, N; Schulz, PS; Wasserscheid, P; Maier, F; (2009) Influence of Different Substituents on the Surface Composition of Ionic Liquids Studied Using ARXPS. J PHYS CHEM B , 113 (9) 2854 - 2864. 10.1021/jp810637d.

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Abstract

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].

Type: Article
Title: Influence of Different Substituents on the Surface Composition of Ionic Liquids Studied Using ARXPS
DOI: 10.1021/jp810637d
Keywords: RAY PHOTOELECTRON-SPECTROSCOPY, SUM-FREQUENCY GENERATION, PHASE SILP CATALYSIS, ELECTRONIC-STRUCTURE, NANOSTRUCTURAL ORGANIZATION, VIBRATIONAL SPECTROSCOPY, MOLECULAR COMPOSITION, AIR/LIQUID INTERFACE, GAS-PHASE, IN-VACUO
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
URI: http://discovery.ucl.ac.uk/id/eprint/1311353
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