HIGH PRESSURE EFFECTS ON HYDROGEN BONDS IN ALCOHOLS AND PHENOLS.

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1965

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Ohio State University

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The utility of infrared spectroscopy at high pressure in studying hydrogen bonded systems is demonstrated. A comparison is made between the effects of high pressure (up to 100 Kbar) and of low temperatures on the -OH stretching, the -OH in-plane deformation, and the -OH out-of-plane-deformation vibrations of some alcohols and phenols. In addition, spectra of polycrystalline solids produced at high pressure or at low temperatures and spectra of single crystals grown at high pressures have been obtained. In some instances, the frequency shifts (compared to liquid frequencies) of these -OH vibrations of the single crystal and polycrystalline solid differed for equivalent pressures. In addition, the frequency shifts produced by pressure sometimes far exceeded those produced by lowering the temperature (to $-190^{\circ}C$). The significance of these differences will be discussed. The half band widths of the $-OH$ stretching vibration have been measured as a function of either increasing pressure or decreasing temperature. Differences between these half band widths will be discussed.

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Author Institution: Battelle Memorial Institute, 505 King Avenue

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