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(μ-Di-tert-butyl-silanediolato)bis-[bis-(η⁵-cyclo-penta-dien-yl)methyl-zirconium].

ABSTRACT: The reaction of t-Bu₂Si(OH)₂ with two equivalents of Cp₂Zr(CH₃)₂ produces the title t-Bu₂SiO₂-siloxide bridged dimer, [Zr₂(CH₃)₂(C₅H₅)₄(C₈H₁₈O₂Si)] or [Cp₂Zr(CH₃)]2[μ-t-Bu₂SiO₂] (1), where one methyl group is retained per zirconium atom. The same product is obtained at room temperature even when equimolar ratios of the silanediol and Cp₂Zr(CH₃)₂ are used. Attempts to thermally eliminate methane and produce a bridging methyl-ene complex resulted in decomposition. The crystal structure of 1 displays typical Zr-CH₃ and Zr-O distances but the Si-O distance [1.628 (2) Å] and O-Si-O angle [110.86 (15)°] are among the largest observed in this family of compounds suggesting steric crowding between the t-Bu substituents of the silicon atom and the cyclo-penta-dienyl groups. The silicon atom lies on a crystallographic twofold axis and both Cp rings are disordered over two orientations of equal occupancy.

SUBMITTER: Berg DJ

PROVIDER: S-EPMC6895932 | biostudies-literature |

REPOSITORIES: biostudies-literature

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(tert-Butyl-imido)bis-(η-cyclo-penta-dien-yl)pyridine-zirconium(IV).

Project description:The title compound, [Zr(C(5)H(5))(2)(C(4)H(9)N)(C(5)H(5)N)], was obtained from the reaction of (C(5)H(5))(2)Zr(py)(η(2)-Me(3)SiC(2)SiMe(3)) (py is pyridine) and (t)BuN=C=N(t)Bu alongside the formation of (C(5)H(5))(2)Zr(CN(t)Bu)(η(2)-Me(3)SiC(2)SiMe(3)). The zirconium atom is coordinated in a distorted tetra-hedral geometry by two cyclo-penta-dienyl ligands, a pyridine ligand, and a tert-butyl-imido ligand via a Zr=N double bond. The tert-butyl group is disordered over two positions in a 0.634 (5):0.366 (5) ratio.

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Di-μ-iodido-bis-[(diethyl ether-κO)(η-1,3-di-tert-butyl-cyclo-penta-dien-yl)ytterbium(II)].

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Crystal structure of bis-(η(5)-cyclo-penta-dien-yl)(1,4-di-tert-butyl-buta-1-en-3-yn-1-yl)zirconium(IV) μ2-hydroxido-bis-[tris(penta-fluoro-phen-yl)borate].

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Crystal structure of bis-(η2-ethyl-ene)(η5-penta-methyl-cyclo-penta-dien-yl)cobalt.

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