Transition Metal Complexes of [2-{Di(m-tolyl)phosphino}ethyl]diphenylphosphine

Abstract

The 1 : 1 complexes of chelating diphosphine, [2-{di(m-tolyl)phosphino}ethyl]diphenylphosphine (pmtpf), with nickel(II), palladium(II) and platinum(II) halides and thiocyanates and 2 : 1 complexes with nickel(II) perchlorates have been prepared. Ligand (pmtpf) forms low-spin square-planar and diamagnetic [M(pmtpf)X₂](where X = Cl, Br, I or NCS; M = Ni, Pd or Pt) and [Ni(pmtpf)₂]- (ClO₄)₂ complexes. Complexes of metal carbonyls having the general formula [(pmtpf)M(CO)₄] (where M = Cr, Mo or W) have also been synthesized. These complexes have been characterized on the basis of element analysis, electronic, infrared and ¹H N.M.R. spectral measurements, magnetic susceptibilities and electrical conductance data. In all cases studied this ligand acts as a chelating ditertiary phosphine.