Reactions of tetrakis(trimethylsilylmethyl)hafnium with trimethylaluminum

Reactions between TiMe 4, Cp 2ZrMe 2 or Hf(CH 2SiMe 3) 4 and AlMe 3 were investigated using conductivity measurements and 1H NMR spectroscopy. Little change was observed in the conductivity of Hf(CH 2SiMe 3) 4/AlMe 3 or AlMe 3/Cp 2ZrMe 2 mixtures in dichloromethane relative to the molar conductivity...

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Bibliographic Details
Published in:Inorganica Chimica Acta 1995-01, Vol.228 (2), p.103-108
Main Authors: Kirss, Rein U., Feighery, William G., Gordon, Douglas C.
Format: Article
Language:English
Subjects:
Alkyl complexes
Alkylsilyl complexes
Aluminum complexes
Hafnium complexes
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Summary:Reactions between TiMe 4, Cp 2ZrMe 2 or Hf(CH 2SiMe 3) 4 and AlMe 3 were investigated using conductivity measurements and 1H NMR spectroscopy. Little change was observed in the conductivity of Hf(CH 2SiMe 3) 4/AlMe 3 or AlMe 3/Cp 2ZrMe 2 mixtures in dichloromethane relative to the molar conductivity of the reactants. In the presence of PEt 3, a small increase in conductivity was observed for the latter solution. A 50-fold increase in the conductivity was observed in mixtures of TiMe 4 and AlMe 3. Spectroscopic studies on mixtures of Hf(CH 2SiMe 3) 4 and AlMe 3 were consistent with formation of a thermally unstable, alkyl bridged heterobimetallic complex, 2, present in a 5:1 ratio to the starting materials.
ISSN:0020-1693
1873-3255
DOI:10.1016/0020-1693(94)04181-T