cis Influence in trans-Pt(PPh3)2 complexes

Abstract

The cis influence of a series of anionic ligands X and Y has been evaluated through the magnitude of the Pt–P coupling constants for compounds of formula trans-[PtXY(PPh₃)₂]. The order of decreasing cis influence was found to be I > Cl > SePh ∼ SPh ∼ SEt > NO₃ > AcO ∼ NO₂ > H > Me > Ph > mtc (mtc = N,N-dimethylmonothiocarbamato-S); moreover, the cis influences of the various ligands was found to be additive. The X-ray structures of three representative compounds (t-4: X = Cl, Y = NO₃; t-5: X = Cl, Y = AcO and t-12: X = Y = NO₂) have also been determined.