Complexes with ligands containing group VB and VIB atoms. Part II. Complexes of palladium(II) and platinum(II) halides with thiomorpholine and thiomorpholin-3-one

Abstract

Complexes of palladium(II) and platinum(II) halides with thiomorpholine and thiomorpholin-3-one have been prepared and characterised. A comparative study has been made of the donor ability of the nitrogen and sulphur atoms in the complexes. I.r., Raman, and ¹H n.m.r. spectroscopic measurements were used to assign the stereochemistry and to determine the mode of co-ordination. Two types of complexes have been isolated, MX₂L₂(M = Pd or Pt, X = halide, and L = thiomorpholin-3-one; or M = Pd, X = Cl, or Br, and L = thiomorpholine) and MX₂L (M = Pd, X = I; or M = Pt, X = halide, and L = thiomorpholine). Results suggest that the former can be formulated as monomeric, trans-square-planar complexes with co-ordination through nitrogen rather than sulphur. The latter are considered to be polymeric with the ligand acting as a bridging group.