Li₂PtF₆ revisited

In comparison with previous stucture determinations of Li₂PtF₆, dilithium hexa­fluorido­platinate(IV) [Graudejus et al. (2000). Inorg. Chem. 39, 2794-2800; Henkel & Hoppe (1968). Z. Anorg. Allg. Chem. 359, 160-177], the current study revealed the Li atom to be refined with anisotropic displacement parameters, thus allowing for a higher overall precision of the model. Li₂PtF₆ adopts the trirutile structure type with site symmetries of 2.mm, m.mm, ..m and m.2m for the Li, Pt and the two F sites. The Pt-F distances in the slightly distorted PtF₆ octa­hedron are essentially similar with 1.936 (4) and 1.942 (6) Å, and the equatorial F-Pt-F angles range from 82.2 (2) to 97.8 (2)°. The Li-F distances in the somewhat more distorted LiF₆ octa­hedron are 1.997 (15) and 2.062 (15) Å, with equatorial F-Li-F angles ranging from 76.3 (7) to 99.71 (17)°.

Crystal structure of Cs₂[Th(NO₃)₆]

The crystal structure of Cs₂[Th(NO₃)₆] can be derived from a dense packing of idealized CsO₁₂ and ThO₁₂ units. The CsO₁₂ units form a distorted hcp arrangement with half of the octa­hedral sites occupied by ThO₁₂ units.