Raman spectra of hydrated cadmium nitrate in the glassy and crystalline state

Abstract

Raman spectra for polycrystalline samples of Cd(NO₃)₂.4H₂O and Cd(NO₃)₂.12H₂O are reported at room temperature and at 80 K. The spectra are compared with the spectrum of the anhydrous salt. The nitrate ion has an almost regular bidentate binding to the cadmium ion in Cd(NO₃)₂.4H₂O, and this is used, with the spectral data, to test the conclusions from normal coordinate calculations.The Raman spectrum of Cd(NO₃)₂.4H₂O. in the glassy state is reported, and it is found that the main features of the corresponding crystal are present in the glass. There are some additional features more characteristic of solution spectra which can be associated with disorder in the amorphous phase.