Surface Enrichment in Equimolar Mixtures of Non-Functionalized and Functionalized Imidazolium-Based Ionic Liquids.

ABSTRACT: For equimolar mixtures of ionic liquids with imidazolium-based cations of very different electronic structure, we observe very pronounced surface enrichment effects by angle-resolved X-ray photoelectron spectroscopy (XPS). For a mixture with the same anion, that is, 1-methyl-3-octylimidazolium hexafluorophosphate+1,3-di(methoxy)imidazolium hexafluorophosphate ([C₈ C₁ Im][PF₆ ]+[(MeO)₂ Im][PF₆ ]), we find a strong enrichment of the octyl chain-containing [C₈ C₁ Im]⁺ cation and a corresponding depletion of the [(MeO)₂ Im]⁺ cation in the topmost layer. For a mixture with different cations and anions, that is, [C₈ C₁ Im][Tf₂ N]+[(MeO)₂ Im][PF

SUBMITTER: Heller BSJ 

PROVIDER: S-EPMC6175172 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature