Cation Exchange at the Interfaces of Ultrathin Films of Fluorous Ionic Liquids on Ag(111)

Journal article


Publication Details

Author(s): Lexow M, Heller B, Partl G, Bhuin RG, Maier F, Steinrück HP
Journal: Langmuir
Publication year: 2019
Volume: 35
Journal issue: 2
Pages range: 398-405
ISSN: 0743-7463
eISSN: 1520-5827


Abstract

In the context of applications with thin ionic liquid (IL) films on solid supports, we studied the ion distribution within mixed thin IL films by angle-resolved X-ray photoelectron spectroscopy. After the deposition of 1-methyl-3-octylimidazolium hexafluorophosphate, [C(8)C(1)Im][PF6], on top of a wetting layer (WL) of 3-methyl-1-(3,3,4,4,4-pentafluorobutyl)imidazolium hexafluorophosphate, [PFBMIm][PF6], on Ag(111) at room temperature (RT), we find a preferential enrichment of the [PFBMIm](+) cation at the IL/vacuum interface. In a similar deposition experiment at 82 K, this cation exchange at the IL/solid interface does not occur. Upon heating the film from 82 K to RT, we observe the replacement of [C(8)C(1)Im](+) by [PFBMIrn]+ at the IL/vacuum interface between similar to 160 and similar to 220 K. No further changes in the surface composition were observed between 220 K and RT. Upon further heating the mixed IL film, we find the complete desorption of [PFBMIm] [PF6] from the mixed film below 410 K, leaving a WL of pure [C(8)C(1)Im][PF6] on Ag(111), which desorbs until 455 K.


FAU Authors / FAU Editors

Bhuin, Radha Gobinda
Lehrstuhl für Physikalische Chemie II
Heller, Bettina
Lehrstuhl für Physikalische Chemie II
Lexow, Matthias
Lehrstuhl für Physikalische Chemie II
Maier, Florian Dr.
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II


External institutions
Leopold-Franzens-Universität Innsbruck / University of Innsbruck


How to cite

APA:
Lexow, M., Heller, B., Partl, G., Bhuin, R.G., Maier, F., & Steinrück, H.-P. (2019). Cation Exchange at the Interfaces of Ultrathin Films of Fluorous Ionic Liquids on Ag(111). Langmuir, 35(2), 398-405. https://dx.doi.org/10.1021/acs.langmuir.8b0351

MLA:
Lexow, Matthias, et al. "Cation Exchange at the Interfaces of Ultrathin Films of Fluorous Ionic Liquids on Ag(111)." Langmuir 35.2 (2019): 398-405.

BibTeX: 

Last updated on 2019-22-02 at 11:23