VIBRATIONAL-SPECTRA OF CRYSTALLINE H2SEO3 IN THE O-H STRETCHING REGION

IR transmission, near-normal IR reflection and polarized Raman spectra of single crystals of selenious acid (H2SeO3) have been obtained at temperatures between 77°K and 335°K. The observed bands in the O-H stretching region have been assigned to two types of O-H....O bonds in the crystal structure. The spectral results appear to rule out correlation field splittings, intramolecular coupling, or Fermi resonance as explanations for the observed splitting. A proposed model based on intermolecular coupling of O-H....O vibrations to explain the splitting of the O-H stretching region is given. © 1979.