Silyl and germyl complexes of platinum and palladium. Part 3. Reactions between silyl and germyl derivatives of Group 6 and four-co-ordinate halogenohydridobis(triethylphosphine)platinum(II) complexes

Abstract

Reactions between Y(MH₃)₂(Y = O, S, or Se; M = Si or Ge) and trans-[PtX(H)(PEt₃)₂](X = Cl, Br, or I) have been investigated by n.m.r. spectroscopy. When X = Br or I and M = Si, trans-[PtX(PEt₃)₂(H₂SiYSiH₃)] and trans-[{PtX(PEt₃)₂(SiH₂)}₂Y] are formed; for M = Ge, the reactions are similar but the products are thermally unstable. When X = Cl, S(SiH₃)₂ and Se(SiH₃)₂ give trans-[PtH(PEt₃)₂(YSiH₃)] and trans-[PtCl(PEt₃)₂(SiClH₂)]; for M = Ge, the reactions are complicated and the products thermally unstable. Reaction between SiH₃(SH) and trans-[PtH(I)(PEt₃)₂] gives trans-[PtI(PEt₃)₂(SiH₂SH)]; with trans-[PtCl(H)(PEt₃)₂], trans-[PtCl(PEt₃)₂(SiClH₂)] and trans-[PtCl(PEt₃)₂(SH)] are formed. The complexes have been characterised by ¹H and ³¹P n.m.r. spectra: ¹⁹⁵Pt, and in some cases ²⁹Si, ⁷⁷Se, and ¹²⁵Te, chemical shifts have been determined by heteronuclear double resonance.