Patent ID: 7087773

Claim:
A metal complex corresponding to the formula (I): where M is titanium, zirconium or hafnium in the +2, +3 or +4 formal oxidation state; R′ independently each occurrence is hydride, hydrocarbyl, silyl, germyl, halide, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, di(hydrocarbyl)amino, hydrocarbyleneamino, di(hydrocarbyl)phosphino, hydrocarbylene-phosphino, hydrocarbylsulfido, halo-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, silyl-substituted hydrocarbyl, hydrocarbylsiloxy-substituted hydrocarbyl, hydrocarbylsilylamino-substituted hydrocarbyl, di(hydrocarbyl)amino-substituted hydrocarbyl, hydrocarbyleneamino-substituted hydrocarbyl, di(hydrocarbyl)phosphino-substituted hydrocarbyl, hydrocarbylene-phosphino-substituted hydrocarbyl, or hydrocarbylsulfido-substituted hydrocarbyl, said R′ group having up to 40 nonhydrogen atoms, and optionally two or more of the foregoing groups may together form a divalent derivative; R″ independently each occurrence is a C 6-12 aryl group; R′″ is a divalent hydrocarbylene- or substituted hydrocarbylene group forming a fused system with the remainder of the metal complex, said R′″ containing from 1 to 30 nonhydrogen atoms; Z is a divalent moiety, or a moiety comprising one σ-bond and a neutral two electron pair able to form a coordinate-covalent bond to M, said Z comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and also comprising nitrogen, phosphorus, sulfur or oxygen; X is a monovalent anionic ligand group having up to 60 atoms exclusive of the class of ligands that are cyclic, delocalized, π-bound ligand groups; X′ independently each occurrence is a neutral ligating compound having up to 20 atoms; X″ is a divalent anionic ligand group having up to 60 atoms; p is zero, 1, 2, or 3; q is zero, 1 or 2, and r is zero or 1.