THE BEHAVIOR OF DITHIOCARBAMIC ESTER PALLADIUM(II) AND PLATINUM(II) COMPLEXES IN DIMETHYL-SULFOXIDE

The complexes [M(MeS2CNMe2)X2] (M=Pd or Pt; X=Cl or Br) decompose in dimethyl sulfoxide, yielding species which contain the dimethyldithiocarbamato moiety. In order to clarify the degradation pathway, the mixed species [M(S2CNMe2)(Me2SO)X] have been prepared and characterized by infrared and 1H NMR spectroscopy and by thermal analysis (TG, DTG and DTA). Although all square planar mixed complexes contain S-bound dimethyl sulfoxide, the platinum derivatives are stabler than the palladium analogues, which release easily the Me2SO molecule either on heating or in solution to form the [Pd(S2CNMe2)X]n species. Accordingly Me2SO interaction with the [M(MeS2CNMe2)X2] complexes depends on the different solvent to metal donor ability. The nature of the interaction products is discussed on the basis of proton NMR spectra in deuterated dimethyl sulfoxide. © 1990.