Nickel(II) uranium(IV) tris­ulfide

Crystals of NiUS₃ were obtained from the reaction of the elements Ni, U, S, and of GeI₂ in a CsCl flux at 1173 K. Nickel(II) uranium(IV) tris­ulfide, NiUS₃, has ortho­rhom­bic (Pnma) symmetry and crystallizes in the GdFeO₃ structure type. The compound has a perovskite ABQ₃-like structure, with U occupying the inter­stitial sites of a NiS₆ framework. The U atoms are coordinated by eight S atoms in a distorted bicapped trigonal–prismatic arrangement. The Ni atoms are coordinated by six S atoms in a slightly distorted octa­hedral arrangement. The asymmetric unit comprises one U site (site symmetry .m.), one Ni site (-1), and two S sites (1 and .m.).

Cs₃ScCl₆

Crystals of tricaesium scandium(III) hexa­chloride were obtained as a side product from the reaction of U, SnCl₂, Sc, and S in a CsCl flux at 1073 K. Cs₃ScCl₆ crystallizes in the Rb₃YCl₆ structure type. The asymmetric unit comprises three Cs sites, two Sc sites, and six Cl sites, all of which have site symmetry 1, except for the two Sc sites that have site symmetries of 2 and -1, respectively. The structure is composed of isolated [ScCl₆]^3- octa­hedra that are surrounded by Cs⁺ cations. Two Cs⁺ cations have inter­actions with eight Cl^- anions, while the third has inter­actions with ten Cl^- anions.