Hexafluorophosphates of chlorotris(dimethyl sulfide)platinum(II) and bromotris (dimethyl sulfide)platinum(II)

The title compounds, chloro­tris­(di­methyl sulfide-kappaS)platinum(II) hexa­fluoro­phosphate, [PtCl(C2H6S)3]PF6, and bromotris­(di­methyl sulfide-kappaS)­platinum(II) hexa­fluoro­phos­phate, [PtBr(C2H6S)3]PF6, are isomorphous and are composed of [PtX(dms)3]+ complex cations (X = Cl and Br, and dms is di­methyl sulfide) and PF6- anions. The Pt atom is coordinated by three S atoms and one X atom in a pseudo-square-planar coordination, with Pt-S distances in the range 2.293 (1)-2.319 (2) Å. Two dms ligands have a staggered conformation with respect to the coordination plane, while the third is rotated by ~90° compared with the orientation of the other two. The packing can be described as consisting of [PtX(dms)3]2(PF6)2 units with a centre of symmetry. In this description, the PtII atom has a pseudo-octahedral coordination, with four normal bonds and two long weak interactions. Density-functional theory calculations show that a conformation in which one dms ligand is not staggered is less favourable than having all three dms ligands staggered