Palladium(II), Platinum(II), and Copper(I) N-Bonded Complexes with Thiazolidine-2-thione as Ligand

Abstract

The preparation and characterization of the (MttznX2) complexes (where M = Pd; or Pt; ttz = thiazolidine-2-thione; n = 2, 3 or 4; X = Cl, Br, I) are reported. By i.r., p.m.r., and u.v.–visible spectra and by magnetic susceptibility and conductivity measurements it appears that in all complexes the ligand is N-bonded to the metal and that many equilibria are present in polar solvents. In particular, for (Mttz4I2)-derivatives there is an equilibrium between a square-planar and a penta-coordinate species. Furthermore, water is competing with the ligands and counterions in the coordination sphere. Our ligand is placed near water in the spectrochemical series. With copper(I) we have obtained complexes of the type (Cuttz3X) (where X = Cl, Br, I, NO3, ClO4, and [Formula: see text]), and in each case the anion is coordinated to the metal. The ttz molecule in these complexes behaves as a hard-base.