Collect. Czech. Chem. Commun. 2006, 71, 411-422

Preparation, Solubility, Infrared Spectra and Radiolysis of Tetramethylammonium Hydrogenselenate Monohydrate and Lithium Tetramethylammonium Selenate Tetrahydrate

David Havlíčeka,*, Libor Tureka, Jiří Plocekb,a and Zdeněk Mičkaa

a Department of Inorganic Chemistry, Faculty of Science, Charles University, Albertov 2030, 128 43 Prague 2, Czech Republic
b Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež near Prague, Czech Republic


Solubility in the (Me4N)2SeO4-H2SeO4-H2O and (Me4N)2SeO4-Li2SeO4-H2O systems were studied. The new compounds, tetramethylammonium hydrogenselenate monohydrate ((Me4N)HSeO4·H2O) and lithium tetramethylammonium selenate tetrahydrate (Li(Me4N)SeO4·4H2O), have been found in these systems. Both substances were characterised by chemical analysis and IR molecular spectroscopy. Both of the title substances decompose under the influence of X-radiation and, thus, their structures cannot be determined. The radiolysis of both substances was studied in greater detail. Tetramethylammonium hydrogenselenate monohydrate is dehydrated by X-radiation to form the anhydrous salt. The reaction is controlled by first-order kinetics with a rate constant of 1.30(3) × 10-3 s-1.

Keywords: Tetramethylammonium salts; Hydrogenselenates; Selenates; Infrared spectroscopy; Radiolysis; Double salts; Solubility diagrams; Kinetics.

References: 25 live references.