In the past few decades,the development of high-performance catalysts has been a key driving force and a center of research efforts in the field of olefin polymerization.However,a major discrepancy exists between industrial researches which utilize aliphatic hy-drocarbon solvents,and academic researches which predominantly focus the catalytic properties in aromatic solvents.In this con-tribution,a novel diaryl-methyl aniline bearing eight tert-butyl groups was prepared and subsequently transformed to four different kinds of imine-type ligands.The corresponding nickel complexes as well as their counterparts derived from diphenyl-methyl aniline without the tert-butyl groups were prepared and investigated in ethylene polymerization.The multiple tert-butyl groups enable great solubility of the metal complexes in aliphatic hydrocarbon solvents,leading to similar polymerization properties comparing with aromatic solvents.In contrast,their counterparts without tert-butyl groups demonstrate significant solvent effect.Moreover,the ligand electronic and steric effects induced by the tert-butyl groups lead to nickel catalysts with great thermal stability (up to 140℃) and capabilities of generating high molecular weight polymer and copolymer products.This tert-butyl strategy can be potentially applied to many different polymerization catalyst systems and help to bridge academic studies with practical applications.