Abstract

The dimeric complex [Ti 2{μ-m-C 6H 4(CO 2CH 2CH 2Ph) 2} 2Cl 8], is, in the presence of activators, a good catalyst for olefin polymerization, its crystal structure has been determined by X-ray diffraction methods and refined by block-diagonal least-squares to R = 0.041 for 3027 independent non-zero reflections. The crystals are monoclinic, space group P2 1 c with Z = 2, in a unit cell of dimensions: a = 13.145(9), b = 10.816(8), c = 21.530(14) Å, β = 108.84(6)°. The crystals consist of dimers possessing a crystallographic symmetry centre and dichloromethane molecules. Titanium atoms are octahedrally coordinated by four chlorine atoms and two carbonyl oxygen atoms of two bis(2-phenylethyl) m-phthalate in the cis position. Two ester ligands and two titanium atoms form a sixteen-membered ring.

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