Bis-biphenylphenoxy catalysts for polymerization of low molecular weight ethylene-based polymers

A process for forming an ethylene-based polymer, said process comprising polymerizing ethylene, and optionally at least one comonomer, in the presence of at least one transition metal molecular complex selected from Formula 1: ** (See formula) ** wherein M is titanium, zirconium, or hafnium, each independently in a +4 formal oxidation state; X and n are selected so that the metal-ligand complex is neutral; each Z moiety is independently -O-, -S-, -N [(C1-C40) hydrocarbyl] -, or -P [(C1-C40) hydrocarbyl] -; RX is selected from the following: a substituted or unsubstituted (C1-C40) hydrocarbyl; a substituted or unsubstituted (C1-C40) heterohydrocarbyl: -Si (RC) 3, -OSi (RC) 3, -Ge (RC) 3, -P (RC) 2, -N (RC) 2, -ORC, -SRC, -NO2, -CN, -CF3, -OCF3, -S (O) RC, -S (O) 2RC, -N = C (RC) 2, -OC (O) RC, -C (O) ORC, -N (R) C (O) RC, -C (O) N (RC) 2, a halogen or a hydrogen; and wherein each RC is independently a substituted or unsubstituted (C1-C30) hydrocarbyl, or a substituted or unsubstituted (C1-C30) heterohydrocarbyl; Ry is selected from the following: a substituted or unsubstituted (C1-C40) hydrocarbyl; a substituted or unsubstituted (C1-C40) heterohydrocarbyl; -Si (RC) 3, -OSi (RC) 3, -Ge (RC) 3, -P (RC) 2, -N (RC) 2, -ORC, -SRC, -NO2, -CN, -CF3, -OCF3, -S (O) RC, -S (O) 2RC, -N = C (RC) 2, -OC (O) RC, -C (O) ORC, -N (R) C (O) RC , -C (O) N (RC) 2, a halogen or a hydrogen; and wherein each RC is independently substituted or unsubstituted (C1-C30) hydrocarbyl, or a substituted or unsubstituted (C1-C30) heterohydrocarbyl; and where, when Rx is hydrogen, Ry is not hydrogen, and when Ry is hydrogen, Rx is not hydrogen; and wherein Rx and Ry can optionally form a ring structure; and wherein R1a, R2a, R3a, R4a, R1b, R2b, R3b, R4b, R6c, R7c, R8c, R6d, R7d and R8d each, independently, is selected from the following: a substituted hydrocarbyl (C1-C40) or unsubstituted, a substituted or unsubstituted (C1-C40) heterohydrocarbyl, -Si (RC) 3, -OSi (RC) 3, -Ge (RC) 3, -P (RC) 2, -N (RC) 2, -ORC, -SRC, -NO2, -CN, -CF3, -OCF3, -S (O) RC, -S (O) 2RC, -N = C (RC) 2, -OC (O) RC, -C (O) ORC, -N (R) C (O) RC, -C (O) N (RC) 2, a halogen or a hydrogen; and wherein each RC is independently a substituted or unsubstituted (C1-C30) hydrocarbyl, or a substituted or unsubstituted (C1-C30) heterohydrocarbyl; and wherein, for Formula 1, one or more hydrogen atoms may be optionally substituted with deuterium, and wherein, for Formula 1, two or more of R1a, R2a, R3a, R4a, R1b, R2b, R3b, R4b , R6c, R7c, R8c, R6d, R7d and R8d may optionally form one or more ring structures; where n is 2, and each X is independently an alkyl; wherein R5c and R5d are each independently selected from the following: 1,2,3,4-tetrahydronaphthyl; anthracenyl; 1,2,3,4-tetrahydroanthracenyl; 1,2,3,4,5,6,7,8-octahydroanthracenyl; phenanthrenyl; 1,2,3,4,5,6,7,8-octahydrophenanthrenyl; 2,6-dimethylphenyl; 2,6-diisopropylphenyl; 3,5-di (tert-butyl) phenyl; 3,5-diphenylphenyl; 1-naphthyl; 2-methyl-1-naphthyl; 2-naphthyl; 1,2,3,4-tetrahydronaphth-5-yl; 1,2,3,4-tetrahydronaphth-6-yl; anthracen-9-yl; 1,2,3,4-tetrahydro-anthracen-9-yl; 1,2,3,4,5,6,7,8-octahydroanthracen-9-yl; 1,2,3,4,5,6,7,8-octahydrophenanthren-9-yl; indolyl; indolinyl; quinolinyl; 1,2,3,4-tetrahydroquinolinyl; isoquinolinyl; 1,2,3,4-tetrahydroisoquinolinyl; carbazolyl; 1,2,3,4-tetrahydrocarbazolyl; 1,2,3,4,5,6,7,8-octahydrocarbazolyl; 3,6-di (tert-butyl) -carbazol-9-yl; 3,6-di (tert-octyl) -carbazol-9-yl; 3,6-diphenylcarbazol-9-yl; 3,6-bis (2,4,6-trimethylphenyl) -carbazol-9-yl; 2,7-di (tert-butyl) -carbazol-9-yl; 2,7-di (tert-octyl) -carbazol-9-yl; 2,7-diphenylcarbazol-9-yl; or 2,7-bis (2,4,6-trimethylphenyl) -carbazol-9-yl.