Crystals of Zr(p-CH2C6H4CMe3)4, tetra(4-tert-butylbenzyl)zirconium (1), have been studied by X-ray diffraction. The crystals belong to the tetragonal system, space group I4, with a = 16.481 (2), c = 7.131 (4) Å, so that chemically equivalent ligands are also structurally equivalent, unlike other known homoleptic M(CH2-C6H5)4 compounds. Zr-CH2-Cipso bond angles of 90.0 (2)° suggest that ligands are η2-bonded. The structure is discussed along with that of Zr(CH2C6H5)4, tetrabenzylzirconium (2) (redetermined), which is crystallographically unsymmetrical but also of approximate S4 symmetry. The distortion of (2) from tetragonal symmetry (the four Zr- CH2-Cipso bond angles being rather different) is discussed along with crystal packing.

Structures of homoleptic benzyl derivatives of zirconium.

TEDESCO, Consiglia;IMMIRZI, Attilio;PROTO, Antonio
1998

Abstract

Crystals of Zr(p-CH2C6H4CMe3)4, tetra(4-tert-butylbenzyl)zirconium (1), have been studied by X-ray diffraction. The crystals belong to the tetragonal system, space group I4, with a = 16.481 (2), c = 7.131 (4) Å, so that chemically equivalent ligands are also structurally equivalent, unlike other known homoleptic M(CH2-C6H5)4 compounds. Zr-CH2-Cipso bond angles of 90.0 (2)° suggest that ligands are η2-bonded. The structure is discussed along with that of Zr(CH2C6H5)4, tetrabenzylzirconium (2) (redetermined), which is crystallographically unsymmetrical but also of approximate S4 symmetry. The distortion of (2) from tetragonal symmetry (the four Zr- CH2-Cipso bond angles being rather different) is discussed along with crystal packing.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1061833
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