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Probing Conformational Heterogeneity at the Ionic Liquid-Vacuum Interface by Reactive-Atom Scattering

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DateAccepted/In press - 11 Dec 2018
DateE-pub ahead of print - 11 Dec 2018
DatePublished (current) - 17 Jan 2019
Issue number2
Number of pages8
Pages (from-to)156-163
Early online date11/12/18
Original languageEnglish


The atomic-level description of liquid interfaces has lagged behind that of
solid crystalline surfaces because existing experimental techniques have been limited in their capability to report molecular structure in a fluctuating liquid interfacial layer. We have moved toward a more detailed experimental description of the gas−liquid interface by studying the F-atom scattering dynamics on a common ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. When given contrast by deuterium labeling, the yield and dynamical behavior of reactively scattered HF isotopologues can resolve distinct signatures from the cation butyl, methyl, and ring groups, which help to quantify the relative populations of cation conformations at the liquid−vacuum interface. These results demonstrate the importance of molecular organization in driving sitespecific reactions at the extreme outer regions of the gas−liquid interface.

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