Palladium(II) and platinum(II) complexes of dithiocarbamates and L-methioninol

The [M(dithiocarbamato)(Mol)]Cl complexes [M = Pd or Pt; dithiocarbamato = DMDT (Me2NCS2-) or ESDT (EtO2CCH2MeNCS2-); Mol = L-methioninol (L-2- amino-4-methylthio-1-butanol)] have been prepared by reacting methioninol with the appropriate [M(dithiocarbamato)Cl]n complex at 1 : 1 molar ratio in chlorinated hydrocarbons. By operating at 1 : 2 molar ratio, the binuclear species [M2(dithiocarbamato)2(Mol)Cl2] were obtained. The complexes were characterized by i.r., n.m.r. and electrospray ionisation (ESI) mass spectra and by t.g.a. The [M(dithiocarbamato)(Mol)]Cl species are ionic and contain S,N chelated methioninol. The ligand forms a S,N bridge between two metal atoms in the binuclear species, whose formation is confirmed by the presence of the deprotonated molecular ion in the ESI negative ion mode.