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Bis(?-cyclo-penta-dien-yl)bis-(2,4,6-tri-methyl-phenyl-tellurolato)zirconium(IV).

ABSTRACT: The structure of the title compound, [Zr(C(5)H(5))(2)(C(9)H(11)Te)(2)], consists of a zirconium(IV) centre bonded to two ?(5)-coord-inated cyclo-penta-dienyl groups and two mesityltellurolate ligands; the discrete mol-ecule has crystallographic twofold rotation symmetry. The structural parameters compared with those in [(?(5)-Me(5)Cp)(2)Zr(TePh)(2)] [Howard, Trnka & Parkin (1995 ?). Inorg. Chem.34, 5900-5909] show that the greater steric demands of the bulky mesityl substituents are accommodated by widening Te-Zr-Te (?8°) and by more acute Zr-Te-C (?5°) angles, although the Zr-Te distances are essentially the same. The crystal studied exhibited some inversion twinning.

SUBMITTER: Hector AL

PROVIDER: S-EPMC2961163 | biostudies-literature | 2008 Apr

REPOSITORIES: biostudies-literature

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Bis(η-cyclo-penta-dien-yl)bis-(2,4,6-tri-methyl-phenyl-tellurolato)zirconium(IV).

Hector Andrew L AL Levason William W Reid Gillian G Reid Stuart D SD Webster Michael M

Acta crystallographica. Section E, Structure reports online 20080416 Pt 5

The structure of the title compound, [Zr(C(5)H(5))(2)(C(9)H(11)Te)(2)], consists of a zirconium(IV) centre bonded to two η(5)-coord-inated cyclo-penta-dienyl groups and two mesityltellurolate ligands; the discrete mol-ecule has crystallographic twofold rotation symmetry. The structural parameters compared with those in [(η(5)-Me(5)Cp)(2)Zr(TePh)(2)] [Howard, Trnka & Parkin (1995 ▶). Inorg. Chem.34, 5900-5909] show that the greater steric demands of the bulky mesityl substituents are accommodated ...[more]

PMID: 21202209

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(Cyanido-?C)(2,2-di-phenyl-acetamido-?(2) N,O)bis-(?(5)-penta-methyl-cyclo-penta-dien-yl)zirconium(IV).

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cyclo-Tri-?-oxido-tris-{[(?,?)-1,2-bis-(cyclo-penta-dien-yl)-1,1,2,2-tetra-methyl-disilane]zirconium(IV)}: a trimeric disila-bridged oxidozirconocene.

Project description:The title compound, [Zr(3)(C(14)H(20)Si(2))(3)O(3)], consists of three disila-bridged zirconocene units, which are connected via an oxide ligand, forming a nearly planar six-membered ring with a maximum displacement of 0.0191?(8)?Å. The compound was isolated as a by-product from a mixture of [(C(5)H(4)SiMe(2))(2)ZrCl(2)] and Li[AlH(4)] in Et(2)O.

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Project description:The title mol-ecule, [ZrBr(2)(C(12)H(14)Si)], possesses a crystallographically imposed twofold rotational symmetry with the rotation axis passing through the Zr and Si atoms. The Zr(IV) centre is in a distorted tetra-hedral environment defined by two Cp rings of chelating organic ligands and two Br anions. Two five-membered rings form a dihedral angle of 59.7 (2)°. Unequal Zr-C bonds [2.471 (3)-2.556 (3) Å] in the mol-ecule indicate that the inter-action of the central metal with the [(C(5)H(4))(2)SiMe(2)](2-) ligand contains noticeable η(3)-allyl and η(2)-olefin contributions.

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

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Bis(?-penta-methyl-cyclo-penta-dien-yl)cobalt(II).

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?-Oxido-bis-[bis-(penta-fluoro-phenolato)(?-penta-methyl-cyclo-penta-dien-yl)titanium(IV)].

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(Glycol-?O,O')nitros-yl(?-penta-methyl-cyclo-penta-dien-yl)ruthenium(II) bis-(tri-fluoro-methane-sulfonate).

Project description:The title compound, [Ru(C(10)H(15))(NO)(HOCH(2)CH(2)OH)](CF(3)SO(3))(2), possesses a three-legged piano-stool geometry around the Ru atom, with an average Ru-O distance of 2.120?(6)?Å and an Ru-N-O angle of 159.45?(14)°. The ethyl-eneglycol ligand forms a non-planar metallacyclic ring by chelating the Ru atom via the O atoms. The O?O distances of 2.554?(2) and 2.568?(2)?Å are indicative of hydrogen bonding between coordinated ethyl-eneglycol and outer-sphere trifluoro-methane-sulfonate fragments. The crystal packing is stabilized by ionic forces and several CH(3)?·F (2.585 and 2.640?Å) and CH(3)?O inter-actions (2.391, 2.678, 2.694 and 2.699?Å) between the penta-methyl-cyclo-penta-dienyl ligand and trifluoro-methane-sulfonate anion. There is noticeable short inter-molecular contact [2.9039?(16)?Å], between an O atom of the SO(3) group and a C atom of the penta-methyl-cyclo-penta-dienyl ligand.

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Tri-?-chlorido-bis-[(?(5)-penta-methyl-cyclo-penta-dien-yl)rhodium(III)] hexa-fluorido-phosphate from synchrotron radiation.

Project description:In the title complex salt, [{(?(5)-C5Me5)Rh}2(?-Cl)3]PF6, the dinuclear, single-charged cation is formed by the cojoining of two classic (?(5)-C5Me5)RhCl3 'piano-stool' units by bridging of the three choride ligand 'legs'. The crystal structure shows several close H?F contacts between the hexa-fluorido-phosphate counter-ions and the C5Me5 ligands.

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Crystal structure of di-n-but-yl-bis-(? (5)-penta-methyl-cyclo-penta-dien-yl)hafnium(IV).

Project description:The crystal structure of the title compound, [Hf(C10H15)2(C4H9)2], reveals two independent mol-ecules in the asymmetric unit. The diffraction experiment was performed with a racemically twinned crystal showing a 0.529?(5):0.471?(5) component ratio. Each Hf(IV) atom is coordinated by two penta-methyl-cyclo-penta-dienyl and two n-butyl ligands in a distorted tetra-hedral geometry, with the cyclo-penta-dienyl rings inclined to one another by 45.11?(15) and 45.37?(16)°. In contrast to the isostructural di(n-butyl)bis(? (5)-penta-methyl-cyclo-penta-dien-yl)zirconium(IV) complex with a noticeable difference in the Zr-butyl bonding, the Hf-Cbut-yl bond lengths differ from each other by no more than 0.039?(3)?Å.

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