The new compound hexacaesium hexatellurido digermanate(III), Cs6Ge2Te6, has been prepared by reacting the elements in a stoichiometric ratio at 923 K in an evacuated silica glass tube. The title compound crystallizes as black columns and is isostructural to K6G e2Te6 (C2/c, a = 17.027(2), b = 14.237(1), c = 10.104(1) Å, β = 96.701(8)°, Z = 4 (5130 reflections, R1 (I > 2 σ (I)) = 0.042). The structure ist composed of isolated distorted Te6 octahedra, with Ge-Ge dumbbells at the centres. The caesium cations are arranged between the isolated Ge2Te6 octahedra. The Ge-Ge bond lengths in A6Ge2Te6 (A = alkali metal) increase significantly as the counter ions are varied from sodium to caesium.

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The new compound hexacaesium hexatelluridodistannate(III), Cs6Sn2Te6, has been prepared by reacting a stoichiometric ratio of the elements at 923 K in an evacuated silica-glass tube. The title compound crystallizes as black columns of the K 6 Ge 2 Te 6 type. The structure is composed of isolated distorted Te6 octahedra, with Sn-Sn dumbbells at the centres. The caesium cations are arranged between the isolated Sn 2 Te 6 octahedra.