Olefin polymerization catalysts bearing a 6-amino-N-aryl azaindole ligand

A metal-ligand complex according to formula (I):

• where:
• M is a metal chosen from titanium, hafnium, and zirconium, the metal having a formal oxidation state of +4;
• Y1, Y2, Y3, and Y4 are independently C(R1), N, or N(R1), where
• each R1 is H, halogen, (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, Si(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)—, or (RC)2NC(O)—, and where optionally any two or more R1 are joined as a ring having from 5 to 16 atoms excluding all hydrogen atoms;
• R2 is H, (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, Si(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)—, or (RC)2NC(O)—where optionally R2 is joined with one or more groups R1 as a ring having from 5 to 16 atoms excluding all hydrogen atoms;
• R3 is (C1-C40) hydrocarbyl or (C1-C40) heterohydrocarbyl;
• L1 is independently (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, or a ligand of formula (II) complexed to the metal M at (*);
• L2 and L3 are independently halogen, (C1-C40) hydrocarbyl, or (C1-C40) heterohydrocarbyl;
• R4, R5, R6, R7, R8, and R9 are independently H, halogen, (C1-C40) hydrocarbyl, (C1-C40) heterohydrocarbyl, Si(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)—, or (RC)2NC(O)—;
• each RC in the metal-ligand complex is independently (C1-C30) hydrocarbyl or H;
• each RP in the metal-ligand complex is independently (C1-C30) hydrocarbyl or H;
• and
• each RN in the metal-ligand complex is independently (C1-C30) hydrocarbyl or H.