Asymmetric homo- and hetero-bimetallic complexes of the nickel group elements. Crystal structure of [(C6F5)2Pd(µ-Cl)2Pt(PEt3)2]

Abstract

By reaction between cis-[Pd(C₆F₅)₂(PhCN)₂] and cis-[MX₂L₂] in dichloromethane, the asymmetric homo- and hetero-bimetallic complexes [R₂Pd(µ-X)₂ML₂] are formed (M = Ni, Pd or Pt; X = Cl, Br, I or SCN; R = C₆F₅ or C₆H₂F₃-2,4,6; L = PEt₃, PBu₃, PPh₂Me or C₅H₅N; L₂= Ph₂PCH₂CH₂PPh₂). In chloroform solution all the gem derivatives are binuclear. The crystal structure of [(C₆F₅)₂Pd(µ-Cl)₂Pt(PEt₃)₂] has been solved and refined to R= 0.042 for 4241 observed reflections, confirming the existence of binuclear molecules where the Pd and Pt atoms have square-planar co-ordination [Pd–Cl 2.449(2) and 2.402(2) and Pt–Cl 2.430(2) and 2.386(2)Å].