Investigation of hydrogen bonding in aqueous acetone mixtures by Raman spectroscopy
Bo Yang, Zhe Liu, Shenghan Wang, Chenglin Sun, Zhiwei Men
Abstract
Abstract The Raman spectra of aqueous acetone solution with various concentrations were measured at room temperature and atmospheric pressure. We find that the peak at ~3400 cm −1 showed a significant blue shift at V a ( V a represents the volume fraction of acetone) >0.2, whereas the peak at 197 cm −1 exhibited red shift under the same conditions. The results indicate that the cage structure of water is destroyed and a large number of water molecules form acetone–water complex with acetone molecules. Moreover, the acetone–water complex from the acetone–(water) 2 structure gradually changed to acetone–water at V a > 0.6. In addition, the Raman spectra of methyl groups were also studied, which illustrates that the methyl group of acetone forms a hydrophobic hydrated structure. Finally, the phase transition process of acetone–water complex in methanol–water binary solution was discussed.