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.

中文翻译：

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用拉曼光谱研究丙酮水溶液中的氢键

在室温和大气压下测量了各种浓度的丙酮水溶液的拉曼光谱。我们发现~3400 cm ^-1处的峰在V _a（V _a代表丙酮的体积分数）> 0.2处显示出明显的蓝移，而在相同条件下197 cm ^-1处的峰显示出红移。结果表明，水的笼状结构被破坏，大量水分子与丙酮分子形成丙酮-水复合物。此外，丙酮-(水) ₂结构的丙酮-水络合物在V _a逐渐变为丙酮-水 > 0.6。此外，还研究了甲基的拉曼光谱，说明丙酮的甲基形成了疏水的水合结构。最后，讨论了丙酮-水络合物在甲醇-水二元溶液中的相变过程。