Metal complexes of sulphur ligands. Part II. Reaction of bis(diphenylphosphinodithioato)-platinum(II) and -palladium(II) with ligands containing group VB atoms
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3690-3696
- https://doi.org/10.1039/j19710003690
Abstract
Reaction of Pt(S2PPh2)2 with tertiary phosphines (PPh3, PMePh2, PMe2Ph) gives crystalline 1 : 1 and 1 : 2 adducts. With triphenylarsine or triphenylstibine, only 1 : 1 adducts can be isolated and with pyridine, i.r. evidence indicates that the 1 : 1 adduct is only stable in solution in the presence of an excess of pyridine. As reported earlier for the analogous palladium compounds, the 1 : 2 adducts rapidly dissociate to the 1 : 1 compounds in non-polar solvents (benzene or carbon disulphide); however, it is now found that they can be stabilised in more polar solvents (dichloromethane or nitromethane). Conductivity measurements in the latter suggests all these 1 : 2 adducts have a four-co-ordinate ionic structure and this is confirmed by an X-ray analysis of [Pd(S2PPh2)(PEt3)2]S2PPh2. An X-ray analysis on [Pd(S2PPh2)2(PPh3)] suggests a four-co-ordinate monomeric structure for the 1 : 1 compounds with uni- and bi-dentate co-ordination of dithioacid ligands. Finally, an empirical i.r. method for distinguishing unidentate, bidentate, and ionic modes of co-ordination of the diphenylphosphinodithioato-group to platinum and palladium is discussed.Keywords
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