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Building bridges: Increasing capabilities of hydrogen bond formation in a set of imidazolium ionic liquids allow the direct observation of hydrogen bonding (circled in picture; C gray, H white, F orange, N blue, O red, S yellow) by far-IR spectroscopy. Frequency shifts are assigned to the ability and strength of H-bond formation. Reduced mass effects are negligible and the interactions are local and directional.
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Wulf et al. (2009) studied this question.
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