Acta Cryst. (2013). E69, i38 [ doi:10.1107/S1600536813013603 ]
Abstract: The crystal structure of trisodium potassium dodecamolybdenum tetradecasulfide, Na2.9 (2)KMo12S14, consists of Mo12S14S6 cluster units interconnected through interunit Mo-S bonds and delimiting channels in which the Na+ cations are disordered. The cluster units are centered at Wyckoff positions 2d and have point-group symmetry 3.2. The K atom lies on sites with 3.2 symmetry (Wyckoff site 2c) between two consecutive Mo12S14S6 units. One of the three independent S atoms and one Na atom lie on sites with 3.. symmetry (Wyckoff sites 4e and 4f). The other Na atom occupies a 2b position with -3.. symmetry. The crystal studied was a merohedral twin with refined components of 0.4951 (13) and 0.5049 (13).
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