Tricaesium Tetraiodozincate(II) Iodide, Cs₃ZnI₅

Cs₃ZnI₅ is isotypic with Cs₃CoI₅, (NH₄)₃ZnCl₅ and Cs₃HgCl₅. The structure consists of distorted [ZnI₄]^2- tetrahedra and chains of face-sharing [Cs₆I]⁵⁺ octahedra parallel to the x axis. The ninefold coordination around one Cs⁺ ion is best described as a quadratic antiprism with one of the basal faces centred. The other Cs⁺ ion is coordinated by eight I^- ions in the form of a strongly truncated `bisdisphenoid'.

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