Spectroscopic and thermal properties of VOSeO3 · 3 H2O and VOSeO3

The infrared spectra of VOSeO3 · 3 H2O, obtained by precipitation from aqueous solutions, and of the polymeric phase VOSeO3, prepared by solid state reaction, were recorded and discussed. The investigation of the thermal behaviour of VOSeO3 · 3 H2O shows that it is impossible to obtain a simple anhydrous vanadyl(IV) selenite. At temperatures around 400 0C, and after the release of water, a loose of SeO2 was observed. The results suggest the possible existence of V-Se oxocompounds in the composition range SeO2/VO2 < 1. (author)