Ag_1.91Cs_1.16Mo₉S₁₁: a novel quaternary reduced molybdenum sulfide containing Mo₉ clusters

Ag_1.911 (6)Cs_1.16 (3)Mo₉S₁₁, silver caesium nona­molybdenum undeca­sulfide, is isostructural with the archetype h-Mo₉Se₁₁. Its crystal structure consists of Mo₉S₁₁S₆ cluster units centered on the Wyckhoff site 2d and inter­connected through inter-unit Mo-S bonds. The Mo-S framework delimits channels in which the Cs⁺ cations are disordered. The Ag atoms are located on mirror planes around the threefold axes between two consecutive Mo₉S₁₁S₆ units.