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

Ammonium selenites

Z. Mička, P. Pikal, and M. Ebert

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

Abstract: The solubility diagrams of the (NH₄)₂SeO₃—H₂SeO₃—H₂O system at 298 К and 303 К were studied for the first time. The effect of temperature on the character of the studied system considering the formation of diselenite from hydrogen selenite was examined. The results of the solubility studies were employed to prepare ammonium hydrogen selenite, NH₄HSeO₃, ammonium trihydrogen-bis(selenite), NH₄H₃(SeO₃)₂, and ammonium diselenite (NH₄)₂Se₂O₅. The thermoanalytical properties of the selenites (NH₄)₂SeO₃ and (NH₄)₂SeO₃•H₂O were studied and mechanisms were proposed for the thermal decomposition. The force constants of the selenium-oxygen bonds were found on the basis of a study of the infrared molecular spectra.

Full paper in Portable Document Format: 395a617.pdf

Chemical Papers 39 (5) 617–628 (1985)