Abstract
Infrared (IR) and visible absorbance spectra were measured as a function of hydrostatic pressure for five kinds of organic crystals composed of hydrogen-bonded molecular chains. An unconventional vibrational band is observed in the IR spectra around 1800 cm−1 commonly in these compounds and its intensity rapidly increases with pressure. We have ascribed the observed band to a proton vibration localized around kink-type defects or solitons in the hydrogen-bonded molecular chains. In accordance with the pressure-induced growth of the IR band, a new electronic absorption band appears in the visible region below the ordinary molecular excitation, suggesting a change in the electronic structures within the molecules around the soliton.
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