Transition metal catalysts for olefin polymerization

A catalyst system comprising a metal-ligand complex according to formula (I):

• where
• M is a metal chosen from zirconium or hafnium, the metal having a formal oxidation state of +2, +3, or +4;
• each X is a monodentate or bidentate ligand independently chosen from unsaturated (C2-C50)hydrocarbon, unsaturated (C2-C50)heterohydrocarbon, (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, cyclopentadienyl, substituted cyclopentadienyl, (C4-C12)diene, halogen, —N(RN)2, or —NCORC;
• n is 1, 2, or 3;
• m is 1 or 2;
• the metal-ligand complex has 6 or fewer metal-ligand bonds;
• each T is nitrogen or CR4, wherein each R4 is independently chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, —Si(RC)3, —Ge(RC)3, —P(RP)2, —N(RN)2, —ORC, —SRC, —NO2, —CN, —CF3, halogen, or —H;
• each R1 is independently selected from the group consisting of an aliphatic (C1-C50)hydrocarbyl, an aliphatic (C1-C50)heterohydrocarbyl, -halogen, or —H, and, when m is 2, two R1 are optionally covalently connected to each other;
• each R2 is independently chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, —Si(RC)3, or —Ge(RC)3;
• R1 and R2 are optionally covalently connected to form a ring structure;
• each R3 and each R5 is independently chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, —Si(RC)3, —Ge(RC)3, —P(RP)2, —N(RN)2, —ORC, —SRC, —NO2, —CN, —CF3, RCS(O)—, RCS(O)2—, (RC)2C═N—, RCC(O)O—, RCOC(O)—, RCC(O)N(R)—, (RC)2NC(O)—, halogen, or —H;
• each R6 is independently chosen from (C1-C50)hydrocarbyl, (C1-C50)heterohydrocarbyl, (C6-C50)aryl, (C4-C50)heteroaryl, —Si(RC)3, —Ge(RC)3, —P(RP)2, —N(RN)2, —ORC, —SRC, —NO2, —CN, —CF3, RCS(O)—, RCS(O)2—, (RC)2C═N—, RCC(O)O—, RCOC(O)—, RCC(O)N(R)—, (RC)2NC(O)—, or halogen;
• R5 and R6 are optionally covalently connected to form a ring structure;
• and
• each RC, RP, and RN in formula (I) is independently a (C1-C50)hydrocarbyl.