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.
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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://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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