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Synthesis, structure and reactivity of new yttrium bis(dimethylsilyl)amido and bis(trimethylsilyl)methyl complexes of a tetradentate bis(phenoxide) ligand

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Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Cai, C.-X., Toupet, L., Lehmann, C. W., & Carpentier, J.-F. (2003). Synthesis, structure and reactivity of new yttrium bis(dimethylsilyl)amido and bis(trimethylsilyl)methyl complexes of a tetradentate bis(phenoxide) ligand. Journal of Organometallic Chemistry, 683(1), 131-136. doi:10.1016/S0022-328X(03)00513-8.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-9813-A
Abstract
The reactions of a bulky amino-methoxy bis(phenolate) ligand H2L with Y(CH2SiMe3)3(THF)2 and Y[N(SiHMe2)2]3(THF)2 under mild condition leads to the selective formation of the thermally stable complexes [L]Y(CH2SiMe3)(THF) (1) and [L]Y[N(SiHMe2)2](THF) (2). The X-ray structures revealed very similar binding of the [ONOO] ligand core to the metal for both complexes, which feature an octahedral geometry involving coordination of the methoxy side-arm of the ligand and of a remaining THF molecule. 1H-NMR spectroscopy indicates that the solid state structure of 1 and 2 is retained in hydrocarbon solutions with THF coordinated to yttrium. Alkyl complex 1 showed no activity in ethylene polymerization, presumably due to the presence of coordinated THF. The amido complex 2 catalyzed sluggishly the polymerization of methyl methacrylate to give isotactic-rich PMMA but is very active for the ring-opening polymerization of ε-caprolactone.

New alkyl and amido yttrium complexes of a tetradentate bis(phenolate) ligand have been prepared, structurally characterized and investigated as polymerization catalysts.