Infrared Absorption Spectra of Some Hydroxy Compounds in the 3 Micron Region

Abstract

Infrared absorption spectra are reported in the region 2.6 to 3.8 microns for the solid state and for solutions in carbon tetrachloride of 10 sterically hindered hydroxy compounds. Absorption types vary from that of 2,4,6-tri-t-butyl phenol, where the OH group is completely " free " in both states, to that of 3,5-diaceto-p-cresol where the bands are diffuse and are centred about 3.4 microns corresponding to very strong hydrogen bonding. Deuteration studies suggest that splitting of the free OH band in several cases may arise from azimuthal orientations of the OH group and for tri-cyclohexyl carbinol -ΔH for this equilibrium has been estimated at 1 kcal/g-mole.