Abstract
Hydrogenselenates of Rare Earth Elements: Syntheses and Crystal Structures of La(HSeO4)3 and Gd(HSeO4)(SeO4) Colorless transparent single crystals of La(HSeO4)3 (hexagonal, P63/m, Z = 2, a = 971.7(1), c = 616.98(8) pm, Rall = 0.0440) were obtained from the reaction of La2O3 and conc. selenic acid. La(HSeO4)3 is isotypic with the corresponding hydrogensulfate. Its structure can be seen as a variant of the UCl3 type structure with complex anions and contains the La3+ ions in ninefold coordination of oxygen atoms. Single crystals of Gd(HSeO4)(SeO4) crystallize from a solution of Gd2O3 in selenic acid (70% H2SeO4). In the orthorhombic crystal structure (Pbca, Z = 8, a = 920.4(1), b = 1351.6(2), c = 1004.0(1) pm, Rall = 0.0276) the Gd3+ ions are coordinated by eight oxygen atoms belonging to four SeO42– and four HSeO4– ions. These are surrounded by four Gd3+ ions.
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