Acta Cryst. (2009). E65, i15  [ doi:10.1107/S1600536809004991 ]

I₈As₂₁Ge₂₅

K. Ayouz, M. Kars, A. Rebbah and H. Rebbah

Abstract: Single crystals of octaiodine henacosarsenic pentacosagermanium were grown by chemical transport reactions. The structure is isotypic with the analogous clathrates-I. In this structure, the statistically occupied clathrand atoms (As,Ge)₄₆ form bonds in a distorted tetrahedral coordination and their arrangement can define two polyhedra of different sizes; one is an (As,Ge)₂₀ pentagonal dodecahedron, and the other is an (As,Ge)₂₄ tetrakaidecahedron. The guest atom (iodine) resides inside these polyhedra with site symmetry m3 (Wyckoff position 2a) and 2m (Wyckoff position 6d), respectively.

Online 18 février 2009

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