Hydrogen Bonding in Ionic Liquids Probed by Linear and Nonlinear Vibrational Spectroscopy
Abstract
Three imidazolium-based ionic liquids of the type [Cnmim][NTf2] with varying alkyl chain lengths (n = 1, 2 and 8) at the 1 position of the imidazolium ring were studied applying IR, linear Raman, and multiplex CARS spectroscopy. The focus has been on the CH-stretching region of the imidazolium ring, which is supposed to carry information about a possible hydrogen bonding network in the ionic liquid. The measurements are compared to calculations of the corresponding anharmonic vibrational spectra for a cluster of [C2mim][NTf2] consisting of four ion pairs. The results support the hypothesis of weak hydrogen bonding involving the C(4)-H and C(5)-H groups and somewhat stronger hydrogen bonds of the C(2)-H groups.
Keywords
Cite
@article{arxiv.1207.1213,
title = {Hydrogen Bonding in Ionic Liquids Probed by Linear and Nonlinear Vibrational Spectroscopy},
author = {C. Roth and S. Chatzipapadopoulos and D. Kerlé and F. Friedriszik and M. Lütgens and S. Lochbrunner and O. Kühn and R. Ludwig},
journal= {arXiv preprint arXiv:1207.1213},
year = {2015}
}
Comments
revised manuscript, accepted for publication in New J. Phys