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Hydrogen-Bond Dynamics in a Protic Ionic Liquid: Evidence of Large-Angle Jumps

Hunger, J. ; Sonnleitner, Thomas ; Liu, Liyuan ; Buchner, Richard ; Bonn, M. ; Bakker, H. J.


We study the mol. rotation of the protic room-temp. ionic liq. ethylammonium nitrate with dielec. relaxation spectroscopy and femtosecond-IR spectroscopy (fs-IR) of the ammonium N-H vibrations. The results suggest that the rotation of ethylammonium ion takes place via large angular jumps. Such nondiffusive reorientational dynamics is unique to strongly hydrogen-bonded liqs. such as water and indicates that the intermol. interaction is highly directional in this class of ionic liqs.

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