ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Magnesium selenites

M. Ebert and D. Havlíček

Department of Inorganic Chemistry, Faculty of Natural Sciences, Charles University, 128 40 Prague

Abstract: The soly. diagram in the MgSeO₃-SeO₂-H₂O system at 298 K was studied and Mg(HSeO₃)₂.4H₂O was prepd. MgSeO₃.6H₂O and Mg(HSeO₃)₂.4H₂O were studied by thermal anal., x-ray powder anal., and IR spectroscopy. MgSe₂O₅ was prepd. by thermal decompn. of Mg(HSeO₃)₂.4H₂O and studied in the same manner as the other selenites. The IR spectra yielded the force consts. for the bonds between Se and O: 498 N m^-1 for SeO₃ of MgSeO₃.6H₂O, 532 N m^-1 for the SeO₂ group and 333 N m^-1 for the SeOH group of Mg(HSeO₃)₂.4H₂O and for MgSe₂O₅, 541 N m^-1 for the SeO₂ group and 266 N m^-1 for the Se-O-Se bridge bonds. Anal. of the spectra yielded values for the energy of the H bonds in selenites in the range 20-39 kJ mol^-1 and H bond lengths in the range 269-289 pm.

Full paper in Portable Document Format: 344a441.pdf

Chemical Papers 34 (4) 441–451 (1980)