|High-Pressure and Concentration-Dependent Studies on C-H---O Interactions of Binary Aqueous Mixtures: Formic acid/D[feaf]O and Acetone/D[feaf]O=
|趙明琪; 翁乃心; 張海舟; 江志強; 林聖賢; Chao, Ming-chi; Weng, Nai-hsin; Chang, Hai-chou; Jiang, Jyh-chiang; Lin, Sheng Hsien;
|Journal of the Chinese Chemical Society
|Pressure; Infrared; Spectroscopy; Acetone; Formic acid;
|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 transformed from liquid to high-pressure ice VII, are altered into a band located at ~2950 cm-1. The C-H---O interaction 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.