Heterometallic Polymeric Cluster Compounds Derived from Tetrathiotungstate and Silver( I ): Syntheses and Crystal Structures of {[AgWS4]}n [NH4]n and {[W4Ag5S16]}n[M(DMF)8]n (M = Nd and La)

A one-dimensional polymeric anion chain, composed of octanuclear cyclic cluster fragments [W4Ag4S16]4− linked through Ag+ ions (see below), has been isolated from the ammonium tetrathiotungstate/silver nitrate system. Lanthanide(III) ions (Nd or La), which are coordinated by eight DMF ligands and play a crucial role in the formation of the cluster compound, are encapsulated between the chains.