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

Mixed selenates in the systems [(CH₃)₄N]₂SeO₄-MSeO₄-H₂O  (M=Mg and Ni)

P. Vojtíšek, Z. Sieglová, and M. Ebert

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

Abstract: The solubility diagrams in the [(CH₃)₄N]₂SeO₄-MSeO₄-H₂O  and [(CH₃)₄N]₂SeO₄-NiSeO₄-H₂O systems at 25-degrees-C were studied. Basing on the results obtained the compounds [(CH₃)₄N]₂Mg₃(SeO₄)₄ .21H₂O, [(CH₃)₄N]₂Mg₂(SeO₄)₃.12H₂O, and [(CH₃)₄N]₂Ni(SeO₄)₂.9H₂O, which were not described in the literature till now, were prepared. On the basis of the infrared and electronic spectra, thermal analysis, X-ray powder diffractometry, and the measurement of the magnetic susceptibility the bonding relations in these substances were studied. It was found that the octahedral [M(H₂O)₆]²⁺ and tetrahedral [(CH3)4N]+ cations and the selenate anions SeO₄^2- are the fundamental structural units in these substances.

Full paper in Portable Document Format: 451a11.pdf

Chemical Papers 45 (1) 11–20 (1991)