Trace of the thermally induced evolution mechanism of interactions between water and ionic liquids.

摘要: The thermally induced evolution mechanisms of various interactions in ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate, bmimBF4) and water mixtures have been investigated this paper. In the near-infrared (NIR) spectroscopy, we focus mainly on ν(OH) ν(CH) overtone regions. During heating bmimBF4 mixtures, peak shows a significant blue shift, area different changes three By using perturbation correlation moving window (PCMW) method, ascertained critical temperatures these regions: 25−100, 105−160, 165−190 °C, accordingly performed 2D NIR analysis parts. On basis study results, find several types O−H involved hydrogen bonds (H-B’s) (15 mol %) mixture arrive at their each region. 25−100 strong H-B’s, such as BF4−···water···BF4− BF4−···cyclic dimer...