Surface Enrichment and Depletion Effects of Ions Dissolved in an Ionic Liquid: An X-ray Photoelectron Spectroscopy Study

Surface Enrichment and Depletion Effects of Ions Dissolved in an Ionic Liquid: An X-ray Photoelectron Spectroscopy Study

Surfaces of ionic liquids: Angle‐dependent X‐ray photoelectron spectroscopy (XPS) shows that the surface composition of a solution of [Pt(NH3)4]Cl2 in the ionic liquid 1‐ethyl‐3‐methylimidazolium ethyl sulfate ([EMIM][EtOSO3]) deviates considerably from the bulk composition. The [Pt(NH3)4]2+ cation...

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Veröffentlicht in:Angewandte Chemie International Edition 2006-11, Vol.45 (46), p.7778-7780
Hauptverfasser: Maier, Florian, Gottfried, J. Michael, Rossa, Jürgen, Gerhard, Dirk, Schulz, Peter Steffen, Schwieger, Wilhelm, Wasserscheid, Peter, Steinrück, Hans-Peter
Format: Artikel
Sprache:eng
Schlagworte:
biphasic catalysis
ion exchange
ionic liquids
photoelectron spectroscopy
surface analysis
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Zusammenfassung:Surfaces of ionic liquids: Angle‐dependent X‐ray photoelectron spectroscopy (XPS) shows that the surface composition of a solution of [Pt(NH3)4]Cl2 in the ionic liquid 1‐ethyl‐3‐methylimidazolium ethyl sulfate ([EMIM][EtOSO3]) deviates considerably from the bulk composition. The [Pt(NH3)4]2+ cation is enriched on the surface at the expense of the [EMIM] cation (see picture), while the Cl− anion is depleted to below the XPS detection limit.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200602756