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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)

Friday, November 22, 2019

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