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

Noël, Gilles; Röder, Jens C.; Dechert, Sebastian; Pritzkow, Hans; Bolk, Lars; Mecking, Stefan; Meyer, Franc

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

Dateien

Pyrazolate_based_dinuclear_alpha.pdfGröße: 262.23 KBDownloads: 547

Datum

2006

Autor:innen

Noël, Gilles

Röder, Jens C.

Dechert, Sebastian

Pritzkow, Hans

Bolk, Lars

Mecking, Stefan

Meyer, Franc

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen 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

Zusammenfassung

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.

Fachgebiet (DDC)

540 Chemie

Schlagwörter

dinuclear complexes, N ligands, nickel, olefin polymerisation, palladium

Zitieren

ISO 690

NOËL, 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

BibTex

@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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    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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