Pyrazolate-based dinuclear alpha-diimine-type palladium(II) andnickel(II) complexes : a bimetallic approach in olefin polymerisation

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2006
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Noël, Gilles
Röder, Jens C.
Dechert, Sebastian
Pritzkow, Hans
Meyer, Franc
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A series of compartmental pyrazole/imine dinucleating ligands HL1-HL4 have been prepared with different backbone substitutents and different steric bulk of the appending arylimine groups, and two of them have been structurally characterised. With PdCl2 all ligands form the anticipated pyrazolate-bridged bimetallic complexes LPd2Cl3 (1a-4a) that feature square-planar metal ions, as is confirmed by the X-ray crystallographic analyses of L1Pd2Cl3 (1a) and L3Pd2Cl3 (3a). With NiBr2(dme), however, oligonuclear systems [LNi2Br3]x (1b-4b) are formed according to mass spectrometric findings, which is corroborated by the crystallographic structure of [L3Ni2Br3]3. Complexes 1a-4a can be described as bimetallic versions of Brookhart-type -diimine palladium complexes, where dissociation into mononuclear species is prevented by the dinucleating scaffold and the proximate metal ions are suitably positioned to work in concert during substrate transformation. Upon activation of the complexes with MAO and exposure to ethylene, polyethylene is formed. Whereas the palladium complexes display moderate activities, nickel complexes are very active. From structure/activity correlations it is evident that the presence of backbone substitutents at the pyrazolate scaffold as well as bulky ortho aryl substituents is advantageous for polymerisation. Overall, activities of the Ni complexes and the microstructure of the polymer obtained (total branching, Tm and molecular weights) are still rather similar to the data reported previously for mononuclear cationic diimine nickel complexes.

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540 Chemie
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dinuclear complexes, N ligands, nickel, olefin polymerisation, palladium
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ISO 690NOËL, Gilles, Jens C. RÖDER, Sebastian DECHERT, Hans PRITZKOW, Lars BOLK, Stefan MECKING, Franc MEYER, 2006. Pyrazolate-based dinuclear alpha-diimine-type palladium(II) andnickel(II) complexes : a bimetallic approach in olefin polymerisation. In: Advanced Synthesis and Catalysis. 2006, 348(7-8), pp. 887-897. ISSN 1615-4150. eISSN 1615-4169. Available under: doi: 10.1002/adsc.200505457
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@article{Noel2006Pyraz-9872,
  year={2006},
  doi={10.1002/adsc.200505457},
  title={Pyrazolate-based dinuclear alpha-diimine-type palladium(II) andnickel(II) complexes : a bimetallic approach in olefin polymerisation},
  number={7-8},
  volume={348},
  issn={1615-4150},
  journal={Advanced Synthesis and Catalysis},
  pages={887--897},
  author={Noël, Gilles and Röder, Jens C. and Dechert, Sebastian and Pritzkow, Hans and Bolk, Lars and Mecking, Stefan and Meyer, Franc}
}
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