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

The [M(dithiocarbamato)(Mol)]Cl complexes [M = Pd or Pt; dithiocarbamato = DMDT (Me₂NCS^–₂) or ESDT (EtO₂CCH₂MeNCS^–₂); Mol = L-methioninol (L-2-amino-4-methylthio-1-butanol)] have been prepared by reacting methioninol with the appropriate [M(dithiocarbamato)Cl]_n complex in a 1:1 molar ratio in chlorinated hydrocarbons. By operating at a 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 an 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.