Complexes of palladium and platinum with tetraethyl diphosphite and related ligands

Abstract

Tetraethyl diphosphite (L¹) forms complexes [M₂Cl₄L¹₂](M = Pd or Pt), [Pt₂Cl₄L¹(PMe₂Ph)₂](2), and [Pt₂L¹₂(PMe₂Ph)₄][BPh₄]₄ in which it forms bidentate bridges between two metal atoms. Bis(OO′-ethylene) diphosphite (L²) is unidentate in cis-[MCl₂L²₂](M = Pd or Pt) and bridging in (2) and in similar complexes. 1,1,3,3-Tetraethoxy-2-ethyldiphosphazane (L⁴) and 2-ethyl-1,1,3,3-tetraphenoxydiphosphazane (L⁵) form chelate complexes [MCl₂L](M = Pt, L = L⁴; M = Pd or Pt, L = L⁵). Explanations are offered for the differences in stoicheiometry of the complexes formed by these ligands.