C–H–O interaction of acetone and deuterium oxide has been probed by high pressure. High-pressure study provides the first experimental evidence for the enhancement of hydrophobic hydration of acetone as its aqueous solution was compressed to high-pressure ices. Based on the results, we conclude that the C–H–O interaction may be a distinct possibility to understand the origin of the spectral feature located at ∼2950 cm−1, being sensitive to concentration and pressure dependence. Ab initio calculation results, forecasting the frequency red shift of the C–H stretching vibration as C–H–O is interacted via hydrogen bonding, are discussed. This study demonstrates that high pressure can be used as a valuable means of triggering and investigating C–H–O hydrogen-bonding interaction.
The C‐H—O interactions of formic acid and acetone aqueous solutions were studied under various concentrations. The infrared spectra of acetone/D2O were also measured as a function of pressure. The C‐H stretching frequency of formic acid reveals a red‐shift with dilution. On the other hand, upon diluting acetone with D2O, the blue‐shift with dilution in C‐H stretching frequency was observed. Further high‐pressure study provides the experimental evidence for the enhancement of hydrophobic hydration as the sample was compressed to high‐pressure ices, while C‐H vibration of acetone, being trans formed from liquid to high‐pressure ice VII, are altered into a band located at ∼2950 cm−1. The C‐H—O inter action may be a distinct possibility to understand the band‐shape and frequency‐shift of the C‐H stretching modes of formic acid/D2O and acetone/D2O.
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