Junaid, Bushiri M; Ratheesh, R; Suresh, G; Nayar, V U(Elsevier, August 31, 1995)
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Abstract:
Infrared and polarized Raman spectra of Cu(HSeO3) 2 - H20 single crystal have been recorded
and analysed. The appearance of non-degenerate Se-OH stretching vibrations in the ~x: and ~y:
polarizations of Raman spectra indicate distortion of the HSeO~- ion in the Cu(HSeO3)2 - H20
crystal. The low wavenumber values obtained for the symmetric and asymmetric stretching
vibrations of the HSeO 3 ion are consistent with the strong hydrogen bonding and the influence of
Jahn-Teller distortion as predicted in X-ray diffraction data. The shifting of the stretching and
bending vibrations of the hydroxyl groups and water molecules from the free state values also
confirms the strong hydrogen bonding in this crystal. Broad bands observed for both stretching
and bending regions become sharp in the Raman spectrum recorded at 77 K. A doublet appears for
the Se-OH stretching mode at this temperature indicating the settling of protons in an ordered
position and the absence of intrabond proton tunnelling