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Ce 2 Ru 4 Mg 17  was synthesized by high-frequency melting of the elements in a sealed tantalum ampoule. This magnesium-rich compound crystallizes with a new tetragonal structure type: I4̄2m, a = 986.75(8), c = 1008.7(1) pm, wR2 = 0.0513, 909 F 2  values and 34 variables. The striking structural motifs in the Ce 2 Ru 4 Mg 17  structure are slightly bent CeRu 2  units with short Ce-Ru distances of 231 pm and additionally a short Ce-Ce distance of 307 pm. These features are a direct consequence of the cerium valence. The CeRu 2  units are embedded in a magnesium-rich matrix with a broad range of Mg-Mg distances (291 - 361 pm). Temperature-dependent magnetic susceptibility data show intermediate-valent behavior of the cerium atoms (0.23(5) μ B  per Ce atom) and no magnetic ordering down to 3 K, indicative of almost tetravalent cerium in Ce 2 Ru 4 Mg 17 . The ceriumrich gallide Ce 9 Ru 4 Ga 5  shows an unusually short Ce-Ru distance of 237 pm for the Ce2 position as a result of an intermediate cerium valence. The structural distortions are discussed on the basis of a group-subgroup scheme for La9Ru4In5 (space group I4/mmm) and the superstructure variant Ce 9 Ru 4 Ga 5  (space group I4mm).

Intermediate-valent Cerium in Ce 2 Ru 4 Mg 17 and a Group-Subgroup Scheme for La 9 Ru 4 In 5 and Ce 9 Ru 4 Ga 5