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

Lexow M, Heller B, Partl G, Bhuin RG, Maier F, Steinrück HP (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Book Volume: 35

Pages Range: 398-405

Journal Issue: 2

DOI: 10.1021/acs.langmuir.8b0351

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.

Authors with CRIS profile

Involved external institutions

Leopold-Franzens-Universität Innsbruck / University of Innsbruck Austria (AT)

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://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.

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