Acta Cryst. (2005). E61, i70-i72  [ doi:10.1107/S1600536805011098 ]

Triammonium nonaiododiantimonate(III), (NH₄)₃[Sb₂I₉]

H. Zhang, L. Fang and R.-Z. Yuan

Abstract: The crystal structure of the title compound, (NH₄)₃[Sb₂I₉], which crystallizes in the monoclinic space group P2₁/n, resembles that of hexagonal Cs₃[Sb₂I₉], which crystallizes in space group Pm1. The title compound consists of double layers parallel to (001). Each layer is made up of distorted corner-sharing SbI₆ octahedra. One-third of the ammonium cations reside within six-membered rings formed by corner-sharing SbI₆ octahedra within the layers. The other ammonium cations are situated within three-membered rings built from corner-sharing SbI₆ octahedra near the edges of the layers.

Online 16 April 2005

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