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Far-infrared transmittance spectra (200-30 cm -1 ) of the hydrogen bond in cyclic dimers of 4-n-heptyl-, octyl- and nonyloxybenzoic acids are observed and investigated. The spectral bands at 42, 63, 68 and 82 cm -1 are assigned to the four deformation vibrations: twisting, bending (in and out of the dimer ring plane) and stretching by halfwidth spectral band temperature...
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