Na(2.9)KMo(12)S(14): a novel quaternary reduced molybdenum sulfide containing Mo(12) clusters with a channel structure

The crystal structure of tris­odium potassium dodeca­molybdenum tetra­deca­sulfide, Na(2.9 (2))KMo(12)S(14), consists of Mo(12)S(14)S(6) 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 Mo(12)S(14)S(6) 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).