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Nanoscale organization in the fluorinated room temperature ionic liquid: Tetraethyl ammonium (trifluoromethanesulfonyl)(nonafluorobutylsulfonyl)imide

TitleNanoscale organization in the fluorinated room temperature ionic liquid: Tetraethyl ammonium (trifluoromethanesulfonyl)(nonafluorobutylsulfonyl)imide
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2018
AuthorsF. Celso, Lo, Appetecchi Giovanni Battista, Jafta C.J., Gontrani L., Lopes J.N. Canongia, Triolo A., and Russina O.
JournalJournal of Chemical Physics
KeywordsExperimental evidence, Ionic liquids, Liquids, molecular dynamics, Molecular dynamics simulations, Morphological features, Nano-scale organization, neutron scattering, Room temperature ionic liquids, Spatial heterogeneity, Structural organization, Technological applications

Fluorinated Room Temperature Ionic Liquids (FRTILs) are a branch of ionic liquids that is the object of growing interest for a wide range of potential applications, due to the synergic combination of specifically ionic features and those properties that stem from fluorous tails. So far limited experimental work exists on the micro- and mesoscopic structural organization in this class of compounds. Such a work is however necessary to fully understand morphological details at atomistic level that would have strong implications in terms of bulk properties. Here we use the synergy between X-ray and neutron scattering together with molecular dynamics simulations to access structural details of a technologically relevant FRTIL that is characterised by an anion bearing a long enough fluorinated tail to develop specific morphological features. In particular, we find the first experimental evidence that in FRTILs bearing an asymmetric bis(perfluoroalkyl)sulfonyl-imide anion, fluorous side chains tend to be spatially segregated into nm-scale spatial heterogeneities. This feature together with the well-established micro-segregation of side alkyl chains in conventional RTILs leads to the concept of triphilic ILs, whose technological applications are yet to be fully developed. © 2018 Author(s).


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Citation KeyLoCelso2018