Pressure-enhanced C-H...O interactions in aqueous tert-butyl alcohol

Pressure-enhanced C-H...O interactions in tert-butyl alcohol (TBA)/D2O mixtures are investigated. A pressure-dependent study of the C-H absorption bands indicated that the peak frequency of the strongest C-H stretch band of tert-butyl alcohol in a dilute D2O solution has an unusual nonmonotonic pressure dependence, it initially blue shifts, then red shifts, then blue shifts again with increasing pressure.