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Surface Enrichment and Depletion Effects of Ions Dissolved in an Ionic Liquid: An X‐ray Photoelectron Spectroscopy Study
Author(s) -
Maier Florian,
Gottfried J. Michael,
Rossa Jürgen,
Gerhard Dirk,
Schulz Peter Steffen,
Schwieger Wilhelm,
Wasserscheid Peter,
Steinrück HansPeter
Publication year - 2006
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200602756
Subject(s) - x ray photoelectron spectroscopy , ionic liquid , ion , spectroscopy , x ray , chemistry , ionic bonding , analytical chemistry (journal) , inorganic chemistry , materials science , environmental chemistry , physics , nuclear magnetic resonance , optics , organic chemistry , catalysis , quantum mechanics
Surfaces of ionic liquids : Angle‐dependent X‐ray photoelectron spectroscopy (XPS) shows that the surface composition of a solution of [Pt(NH 3 ) 4 ]Cl 2 in the ionic liquid 1‐ethyl‐3‐methylimidazolium ethyl sulfate ([EMIM][EtOSO 3 ]) deviates considerably from the bulk composition. The [Pt(NH 3 ) 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.