PREPARATION AND PROPERTIES OF MOLYBDENUM AND TUNGSTEN DINITROGEN COMPLEXES .46. PREPARATION OF HETEROBIMETALLIC COMPLEXES WITH A BRIDGING DINITROGEN LIGAND, [WX(PME2PH)4(MU-N2)MCP2CL] (M=TI, X=CL, M=ZR, HF, X=I), AND X-RAY STRUCTURE OF [WI(PME2PH)3(PY)(MU-N2)ZRCP2CL] (PY = PYRIDINE)

Reactions of cis-[W(N2)2(PMe2Ph)4] with either [Cp2TiCl2] (Cp = eta5-C5H5) alone or a mixture of [Cp2MCl2] (M = Zr, Hf) and excess NaI afforded heterobimetallic complexes with a birdging dinitrogen ligand, [WX(PMe2Ph)4(mu-N2)MCp2Cl] (M = Ti, X = Cl; M = Zr, Hf, X = I). The W-Zr complex was further converted into the related dinitrogen complex [WI(PMe2Ph)3(py)-(mu-N2)ZrCp2Cl] (py = pyridine) by treatment with excess py, whose structure has been determined by an X-ray analysis.