Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 129, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2958256
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The structural organization in mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4])/water or methanol was studied by infrared spectroscopy. No drastic change in the concentration dependence of the alkyl C-H band frequency was observed at high concentration of the ionic liquid. This behavior indicates a clustering of the ionic liquid in alkyl regions. Nevertheless, the presence of methanol significantly perturbs the ionic liquid-ionic liquid associations in the imidazolium region. On the basis of the responses to change in pressure and concentration, two different types of O-H species, i.e., free O-H and bonded O-H, were observed in the O-H stretching region. For [bmim][BF4]/water mixtures, the compression leads to loss of the free O-H band intensity. It is likely that free O-H is switched to bonded O-H as high pressures are applied. For [bmim][BF4]/methanol mixtures, the free O-H is still stable under high pressures. (C) 2008 American Institute of Physics.
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