cis and trans Influences in Pt(PPh3)2 Complexes

The cis and the trans influences are important tools to rationalize the bond strengths in complexes. In cis/trans- [PtIIXY(PPh3)2] compounds (X and Y are anionic ligands) the variations of the Pt-P bond strengths can be related to the 1JPtP values, which depend on both the cis and trans influences of X and Y. Analysing the coupling constants of a series of cis and trans-[PtIIXY(PPh3)2] compounds these influences can be rationalized and quantified. The structural trans and cis influences are less manifest, as shown by several crystal structures, which have been determined. A theoretical study will also be described, in order to fully comprehend these systems.