Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 14, Pages 3954-3965Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201304549
Keywords
functionalized ionic liquids; surface analysis; surface enrichment; surface orientation; X-ray photoelectron spectroscopy
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Funding
- DFG [STE 620/9-1]
- European Research Council (ERC) [267376]
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We have performed a systematic study addressing the surface behavior of a variety of functionalized and non-functionalized ionic liquids (ILs). From angle-resolved X-ray photoelectron spectroscopy, detailed conclusions on the surface enrichment of the functional groups and the molecular orientation of the cations and anions is derived. The systems include imidazolium-based ILs methylated at the C2 position, a phenyl-functionalized IL, an alkoxysilane-functionalized IL, halo-functionalized ILs, thioether-functionalized ILs, and amine-functionalized ILs. The results are compared with the results for corresponding non-functionalized ILs where available. Generally, enrichment of the functional group at the surface is only observed for systems that have very weak interaction between the functional group and the ionic head groups.
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