Synthesis and 31P n.m.r. spectroscopy of platinum and palladium complexes containing side-bonded diphenyldiphosphene. The X-ray crystal and molecular structure of [Pd(PhPpph){bis(diphenyl-phosphino)ethane}]

Abstract

The structure of [Pd(PhPPPh)(dppe)], dppe = bis(diphenylphosphino)ethane, obtained by a new and potentially general synthesis, is essentially plannar with only a 3° twist between the PdP₂ planes and a P–P bond distance of 2.121(4)Å; ³¹P n.m.r. data on the analogous platinum complexes show very small s-character in the Pt–P(diphosphene) bonds, suggesting that the structure is essentially a diphosphene bound to Pt^o rather that of a diphosphido(2–)ligand bound to Pt^II.