Metal Allyl Complexes with Bulky Ligands: Stabilization of Homoleptic Thorium Compounds, [(SiMe<sub>3</sub>)<i><sub>n</sub></i>C<sub>3</sub>H<sub>5</sub><sub>-</sub><i><sub>n</sub></i>]<sub>4</sub>Th (<i>n</i> = 1, 2)
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Unlike the parent (C3H5)4Th that decomposes at 0 °C, homoleptic tetra(allyl)thorium complexes [(SiMe3)nC3H5-n]4Th (n = 1, 2) have been prepared from ThBr4(thf)4 and K[(SiMe3)nC3H5-n] that are stable up to 90 °C (n = 1) or 124 °C (n = 2). The molecules, which are fluxional on the NMR time scale, contain the first structurally authenticated Th−allyl bonds. The trimethylsilyl groups cause relatively little perturbation in the core metal−allyl geometry but markedly increase the kinetic stability of the compounds.
创建时间:
2016-05-06



