Substituted group 4 metal complexes, catalysts and olefin polymerization process

A metal complex corresponding to the formula:

• where M is a Group 4 metal that is in the +2, +3 or +4 formal oxidation state;
• RA independently each occurrence is hydrogen, or a hydrocarbyl, halohydrocarbyl, hydrocarbyloxyhydrocarbyl, dihydrocarbylaminohydrocarbyl, dihydrocarbylamino, hydrocarbyloxy, hydrocarbylsilyl, or trihydrocarbylsilylhydrocarbyl group of from 1 to 80 atoms, not counting hydrogen, or two or more RA groups from the same or different metal complexes or RA and RB′ from the same or different metal complexes are covalently linked together;
• Z is a divalent moiety, bound to M via a covalent or coordinate covalent bond, 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 an anionic or dianionic 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 ligand having up to 40 atoms;
• p is zero, 1 or 2, and is two less than the formal oxidation state of M when X is an anionic ligand, and when X is a dianionic ligand group, p is 1;
• q is zero, 1 or 2;
• and
• RB′ corresponds to the formula N(RB)2, wherein two RB groups together form a divalent hydrocarbon moiety or a halo- or silyl-substituted derivative thereof, said group containing from 4 to 40 atoms not counting hydrogen, and comprising at least one fused or unfused aromatic substituent, AR.