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

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