Bis(bidentate) complexes of iminobis(diphenylphosphine chalcogenides)[M{N(XPPh2)2-X,X′}2](X = S or Se; M = Ni, Pd or Pt)

Abstract

The compound NH(SePPh₂)₂ has been synthesised from NH(PPh₂)₂ and selenium in refluxing toluene. A range of complexes [M{N(XPPh₂)₂-X, X′}₂](X = Se, M = Pt 1 or Pd 2; X = S, M = Pt 3, Pd 4 or Ni 5) of the monoanions derived from NH(SePPh₂)₂ and its sulfur analogue have been prepared. The new compounds have been characterised by microanalysis, NMR and IR spectroscopy. The crystal structures of NH(SePPh₂)₂, 1, 2 and 5 were determined. The neutral NH(SePPh₂)₂ crystallised as H-bonded dimer pairs with a noticeable difference in the hydrogen bonded and non-hydrogen bonded PSe bond lengths. The PSe groups are approximately anti. On complexation the anionic ligands are bidentate and in all cases the resulting MX₂P₂N rings are distinctly puckered.