Acta Cryst. (2005). E61, i234-i236  [ doi:10.1107/S1600536805031934 ]

Tetrasamarium(II) oxide hexaiodide, Sm₄OI₆

S. Hammerich, I. Pantenburg and G. Meyer

Abstract: Black single crystals of tetrasamarium(II) oxide hexaiodide, Sm₄OI₆, were obtained from a reaction of SmI₃, SmOI, NaI, and Na in a sealed tantalum container. Sm₄OI₆ crystallizes in space group P6₃mc and, like many M₄OX₆ type oxide halides of divalent metals, adopts the anti-K₆HgS₄/Na₆ZnO₄ type of structure, with K₆HgS₄ I₆OSm₄. A tetrahedron of samarium(II) that incorporates an oxide ion is surrounded by 18 iodide ions which are connected further into a three-dimensional non-centrosymmetric structure. The O atom and one of the Sm atoms occupy sites with 3m symmetry, whereas the second Sm atom and both I atoms are located at sites with m symmetry.

Online 19 October 2005

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