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The structure of the title compound, vanadium indium penta­deca­molybdenum nona­deca­selenide, V 1.42 In 1.83 Mo 15 Se 19 , is isotypic with In 2.9 Mo 15 Se 19  [Grüttner  et al.  (1979  ▶ ).  Acta Cryst.  B 35 , 285–292]. It is characterized by two cluster units Mo 6 Se  i8 Se  a6  and Mo 9 Se  i11 Se  a6  (where  i  represents inner and  a  apical atoms) that are present in a 1:1 ratio. The cluster units are centered at Wyckoff positions 2 b  and 2 c  and have point-group symmetryand, respectively. The clusters are inter­connected through additional Mo—Se bonds. In the title compound, the V 3+  cations replace the trivalent indium atoms present in In 2.9 Mo 15 Se 19 , and a deficiency is observed on the monovalent indium site. One Mo, one Se and the V atom are situated on mirror planes, and two other Se atoms and the In atom are situated on threefold rotation axes.

V1.42In1.83Mo15Se19

V_1.42In_1.83Mo₁₅Se₁₉