Acta Cryst. (2009). E65, i26  [ doi:10.1107/S1600536809007351 ]

The Chevrel phase In_4.07Mo₁₅S_11.87Se_7.13 with mixed chalcogenide occupancy

Y.-S. Lee and S. K. Kang

Abstract: The single-crystal of the title compound, indium pentadecamolybdenum nonadeca(sulfide/selenide), was obtained by solid state reaction with an S/Se mixture. It adopts the structure type of In₃Mo₁₅Se₁₉ and In_3.7Mo₁₅S₁₉, which are non-substituted Chevrel phases in the space group P6₃/m. The Mo, one S/Se and two In sites have point symmetry m.. and two S/Se and one In atoms are in 3.. sites. This compound contains isolated Mo₆ and Mo₉ clusters. The shapes of clusters are octahedral and confacial bioctahedral, respectively, face-capped by chalcogen atoms over each triangle face. The Mo-X bonds (X = S, Se) play an important role for the constitution of the framework. The Mo-X distances of 2.479 (2)-2.6687 (9) Å are within the ranges of average values of Mo-S and Mo-Se distances. The In atoms located on sites with m.. symmetry are partially occupied.

Online 6 March 2009

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