The crystal structures of [N(C2H5)4][Pt{S2C2(CN)2}2] and [H2O]x[NH4]1â x [Pt{S2C2(CN)2}2]·2 â xH2O are described. Both compounds contain anion dimers. In the former the dimer has a slipped configuration with Pt â ¯ S interactions whereas the latter contains the anions in an eclipsed configuration with a Pt over Pt arrangement. The difference in the structures is related to the size and nature of the cation. The electrical conduction and magnetic properties are related to the structures.