MULTINUCLEAR (P-31, SE-77, PT-195) MAGNETIC-RESONANCE STUDIES ON THE INTERACTION OF PLATINUM BIS(N-PROPYLXANTHATE) WITH POTENTIALLY BIDENTATE LIGANDS

The reactions of platinum bis(n-propylxanthate), Pt(S2CO(n)Pr)2(Pt(xan)2) with a number of potentially bidentate Group 15 and mixed Group 15/Group 16 donor ligands (L-L') have been investigated in dichloromethane solution. The products of the reactions have been identified by multinuclear (P-31, Se-77, Pt-195) magnetic resonance, infrared and analytical studies. When reactions in 1:1 molar proportions are carried out at room temperature, one xanthate ligand is often displaced to give [(L-L')Pt(xan)]+ and further reaction occurs to give the dithiocarbonate complex (L-L')Pt(S2CO) and the xanthate ester. If the reactions are carried out at low temperature this reaction is avoided and temperature dependent equilibria of the type (eta-1-L-L')Pt(eta-1-xan)(eta-2-xan) reversible [(eta-2-L-L')Pt(eta-2-xan)]+ + xan- occur because of the similar donor powers of the various ligands. Dithiocarbonate is a much stronger ligand to platinum than xanthate, so these reactions do not occur with this ligand.