| Summary: | 碩士 === 國立東華大學 === 化學系 === 91 ===
Abstract
The infrared spectra of DMSO/D2O and CH3COOD/D2O were measured under various concentrations and pressure. The frequencies of the C-H stretching vibration bands for DMSO/D2O mixtures increase with increasing the mole fraction of D2O, implying the contraction of the C-H bonds. As the pressure was elevated to 1.5 GPa, the C-H vibrations of DMSO/D2O were altered into four bands at ~2927 cm-1, ~2941 cm-1, ~3007 cm-1, and ~3025 cm-1. Further concentration-dependent studies indicated that the spectral features at ~2941 cm-1 and ~3036 cm-1 arise from pressure-induced C-H---O hydrogen bonding between C-H in DMSO and oxygen atom in D2O. Ab initio calculations were performed, while the calculated results are consistent with the interpretations based on the high-pressure infrared experiments. Analogous to DMSO/D2O, the pressure-dependent studies on CH3COOD/D2O mixtures provide the evidence of the C-H---O hydrogen bonding as the pressure was elevated.
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