Preparation, spectroscopic and structural characterization of η1-N and η2-Se,Se′ complexes of a P2N4Se2 ring

Abstract

The reaction of 1,5-Ph₄P₂N₄Se₂, 1, prepared by the treatment of Ph₂PN₂(SiMe₃)₃ with a mixture of SeCl₄ and Se₂Cl₂ in acetonitrile, with [PtCl₂(PEt₃)]₂ gives the adducts [PtCl₂(PEt₃)]_n[η¹-N-Ph₄P₂N₄Se₂](2, n- 1; 3, n- 2) in which the P₂N₄Se₂ ring is shown by an X-ray structural determination of 3 to contain a transannular Se–Se interaction; the oxidative addition of 1 or 2 to Pt(C₂H₄)(PPh₃)₂ produces the corresponding η²-Se,Se′ complexes.