We study the molecular rotation of the protic room-temperature ionic liquid ethylammonium nitrate with dielectric relaxation spectroscopy and femtosecond-infrared 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 liquids such as water and indicates that the intermolecular interaction is highly directional in this class of ionic liquids.

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Publisher ACS
Persistent URL dx.doi.org/10.1021/jz301334j
Journal J. Phys. Chem. Lett.
Hunger, J, Sonnleitner, Thomas, Liu, L, Buchner, R, Bonn, M, & Bakker, H.J. (2012). Hydrogen-bond dynamics in a protic ionic liquid : evidence of large-angle jumps. J. Phys. Chem. Lett., 3(20), 3034–3038. doi:10.1021/jz301334j