1,2-Bis(arylimino)propylpalladium complexes as N-donor chelate ligands towards metals of the first transition series

Abstract

1,2-Bis(arylimino)propylpalladium(II) complexes of the type trans-[PdX{C(NR)CMe(NR)}L₂](X = Cl or Br; R = C₆H₄OMe-p or C₆H₁₁; L = PPh₃ or PMePh₂) and cis-[PdCl{C(NC₆H₄OMe-p)CMe(NC₆H₄OMe-p)}(dppe)](dppe = Ph₂PCH₂CH₂PPh₂) react with anhydrous metal halides, MX₂(X = Cl or Br; M = Fe, Co, Ni, Cu, or Zn) to give 1 : 1 adducts in which the 1,2-bis(arylimino)propyl group acts as a chelating bidentate ligand. These monomeric adducts are paramagnetic (high spin) except for the diamagnetic zinc derivatives. Their electronic spectra in the visible and near-i.r. region indicate a tetrahedral configuration for M. This configuration also accords with the solid-state magnetic moments and with the Mössbauer spectrum of the FeCl₂ derivative.