Preparation and properties of some mercury halide–platinum compounds and crystal structure of di-µ-chloro-(dichloromercurio)bis(dimethylphenylphosphine)platinum(II)

Abstract

The compounds (I)—(VI)(PPhMe₂)₂PtX₂(HgY₂)(X = Cl, Br, or I; Y = Cl or Br) have been prepared by the action of mercury(II) halide on cis-(PPhMe₂)₂PtX₂. The crystal structure of (I; X = Y = Cl) has been determined from diffractometer data. Crystals are monoclinic, space group P2₁/c, with Z= 4 in a unit cell of dimensions : a= 909·2(3), b= 1043·8(4), c= 2428·6(8) pm, β= 105·12(2)°. The structure was solved by Patterson and Fourier methods and refined by least-squares to R 0·057 for 2184 independent reflections. The complex contains two bridging chlorine atoms between Pt and Hg, the co-ordination being essentially square planar about Pt and distorted tetrahedral about Hg. Bond lengths suggest that HgCl₂ is only weakly co-ordinated.