The new intermetallic compound Ru 11Lu 20 was obtained as black single crystals during an attempted comproportionation reaction of lutetium(III) chloride, LuCl 3, with metallic lutetium in the presence of ruthenium metal at 950 °C. Ru 11Lu 20 crystallizes with the trigonal space group R-3, Z = 6, a = 1255.1(1), c = 2973.0(4) pm, R 1 for all data: 0.0380. Ruthenium atoms center eight-, nine- and ten-vertex polyhedra of lutetium atoms which are connected in a complicated manner to a three-dimensional network.
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