Linear-chain platinum(II) dithiocarboxylates: crystal structure of tetrakis(phenyldithioacetato)diplatinum(II)

Abstract

The crystal structure of the linear-chain compound tetrakis(phenyldithioacetato)diplatinum(II) has been determined. It crystallizes in the orthorhombic space group lba2, with unit-cell dimensions a= 9.345(4), b= 29.563(5), c= 12.005(2)Å and Z= 4. The crystal structure consists of Pt₂S₈ dimeric units, with a bridging acetate cage structure, in which the Pt–Pt distance is 2.764(1)Å. The two PtS₄ squares are rotated by 25° from the eclipsed structure. The dimers are stacked along the two-fold c axis with inter-dimer Pt–Pt distances of 3.238(1)Å. The structure has been examined in the light of three other linear-chain platinum(II) dithiocarboxylate compounds. All these complexes are characterized by having high anisotropic optical and electrical properties. Only [Pt₂( PrⁱCS₂)₄], form A, shows appreciable electrical conductivity (σ= 2 × 10^–5Ω^–1 cm^–1) and this is related to the unusual short inter-dimer Pt–Pt distance, 3.081 A. Polarized single-crystal absorption spectra are also reported and discussed.