On-Surface Metathesis of an Ionic Liquid on Ag(111)

Massicot S, Sasaki T, Lexow M, Maier F, Kuwabata S, Steinrück HP (2022)

Publication Type: Journal article

Publication year: 2022

Journal

DOI: 10.1002/chem.202200167

Abstract

We investigated the adsorption, surface enrichment, ion exchange, and on-surface metathesis of ultrathin mixed IL films on Ag(111). We stepwise deposited 0.5 ML of the protic IL diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]) and 1.0 ML of the aprotic IL 1-methyl-3-octylimidazolium hexafluorophosphate ([C8C1Im][PF6]) at around 90 K. Thereafter, the resulting layered frozen film was heated to 550 K, and the thermally induced phenomena were monitored in situ by angle-resolved X-ray photoelectron spectroscopy. Between 135 and 200 K, [TfO]⁻ anions at the Ag(111) surface are exchanged by [PF6]⁻ anions and enriched together with [C8C1Im]⁺ cations at the IL/vacuum interface. Upon further heating, [dema][PF6] and [OMIm][PF6] desorb selectively at ∼235 and ∼380 K, respectively. Hereby, a wetting layer of pure [C8C1Im][TfO] is formed by on-surface metathesis at the IL/metal interface, which completely desorbs at ∼480 K. For comparison, ion enrichment at the vacuum/IL interface was also studied in macroscopic IL mixtures, where no influence of the solid support is expected.

Authors with CRIS profile

Involved external institutions

Osaka University Japan (JP)

How to cite

APA:

Massicot, S., Sasaki, T., Lexow, M., Maier, F., Kuwabata, S., & Steinrück, H.-P. (2022). On-Surface Metathesis of an Ionic Liquid on Ag(111). Chemistry - A European Journal. https://dx.doi.org/10.1002/chem.202200167

MLA:

Massicot, Stephen, et al. "On-Surface Metathesis of an Ionic Liquid on Ag(111)." Chemistry - A European Journal (2022).

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