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Ionic liquids (ILs), such as [BMIM][Tf2N], on well-defined SCILL model catalysts are able to replace weakly adsorbed CO. On Pt, on-top CO remains adsorbed under the ionic liquid layer, but its IR signal red-shifts by over 30 cm−1. IL–adsorbate interactions are mediated by the noble metal and similar to ligands.
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Sobota et al. (2011) studied this question.
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