Effect of pressure on hydrogen bonds on organic solids

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Abstract
The effect of pressure to 125 kbar has been measured on the O–H (or N–H) stretching frequency in a number of hydrogen bonding solids. Some data were also obtained on C–H stretching frequencies and on peak widths. For the hydrogen bonding peaks the initial shift is to lower energy. In a number of cases the direction reverses after shifts of 200–300 cm−1. The C–H frequencies increase in energy at all pressures. The results can be reproduced quite well by a simple model which adds a repulsion from the surroundings to Lippincott's model of an isolated H bond. The regularities observed among a number of substituted phenols are discussed in terms of substituent effects. The C–H bands broadened slightly with pressure while the bands involved in hydrogen bonding broadened substantially. These observations are discussed briefly in terms of a configuration coordinate model.

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