Mc. Chao et al., High-pressure and concentration-dependent studies on C-H---O interactions of binary aqueous mixtures: Formic acid/D2O and acetone/D2O, J CHIN CHEM, 48(3), 2001, pp. 603-607
The C-H---O interactions of formic acid and acetone aqueous solutions were
studied under various concentrations. The infrared spectra of acetone/D2O w
ere also measured as a function of pressure. The C-H stretching frequency o
f formic acid reveals a red-shift with dilution. On the other hand, upon di
luting acetone with D2O, the blue-shift with dilution in C-H stretching fre
quency was observed. Further high-pressure study provides the experimental
evidence for the enhancement of hydrophobic hydration as the sample was com
pressed to high-pressure ices, while C-H vibration of acetone, being transf
ormed from liquid to high-pressure ice VII, are altered into a band located
at similar to 2950 cm(-1). The C-H---O interaction may be a distinct possi
bility to understand the band-shape and frequency-shift of the C-H stretchi
ng modes of formic acid/D2O and acetone/D2O.