Bis(isopropylammonium) tetrasulfidomolybdate(VI)

The title compound, (C3H10N)2[MoS4], was synthesized by passing a rapid stream of H2S into an aqueous isopropylamine solution of molybdic acid. The title compound is isotypic with the corresponding W analogue (C3H10N)2[WS4]; its structure consists of a slightly distorted tetrahedral [MoS4]2− dianion and two crystallographically independent isopropylammonium cations, with all atoms located in general positions. The cations and anion are linked by weak N—H...S and C—H...S interactions, the strength and number of which can explain the observed Mo—S bond distances.