HYDRAZIDO(2-) (OR ISODIAZENE) COMPLEXES OF TUNGSTEN

The complexes [WX2(NNH2)(PMe2Ph)3] (A, X Cl or Br) react with HX in tetrahydrofuran to give hydride complexes WX3H(NNH2)(PMe2Ph)3 (B). B(X Cl) loses PMe2Ph with more HCl to give WCl3H(NNH2)(PMe2Ph)2, which on slow recrystallisation gives [WCl3(NNH2)(PMe2Ph)2] whose X-ray structure has been determined. [WCl3{NNH(Ph)}(PMe2Ph)2] has also been prepared and structurally characterised by X-rays. In both structures the N-hydrogen atoms have been located and the hydrazido (2-) ligands are essentially planar, indicative of very strong conjugation along the MNN chain. © 1979.