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The new compound hexacaesium hexatellurido digermanate(III), Cs 6 Ge 2 Te 6 , 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 K 6 G e 2 Te 6  (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 &gt; 2 σ (I)) = 0.042). The structure ist composed of isolated distorted Te 6  octahedra, with Ge-Ge dumbbells at the centres. The caesium cations are arranged between the isolated Ge 2 Te 6  octahedra. The Ge-Ge bond lengths in A 6 Ge 2 Te 6  (A = alkali metal) increase significantly as the counter ions are varied from sodium to caesium.

Darstellung und Kristallstruktur von Hexacaesium-hexatelluridodigermanat( III) (Cs 6 Ge 2 Te 6 )