Two dimensional infrared (2D-IR) vibrational echo spectroscopy and polarization selective pump prope (PP) experiments were performed on the hydroxyl (OD) stretch of water and short to medium chain length alcohols at low concentration in 1-alkyl-3-methylimidazolium bistriflimide (Rmim NTf2) ionic liquids (ILs). Spectral diffusion rates of the effectively isolated hydroxyl groups were directly related to the structural evolution dynamics of the hydrogen bonded solute and surrounding IL�in particular the bistriflimide anions. Orientational diffusion measurements of the the hydroxyl group further characterized the timescales of H-bond structural randomization in these materials. Systematic variation of the H-bonding probe structure, from water to linear and branched alcohols, allowed detailed observation of the hydrogen bonding landscape within these ionic liquids.

Ultrafast hydrogen bonding dynamics of water and alcohols in ionic liquids

248th National Meeting (2014)

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