Fluorine-containing amino imine nickel complex as well as preparation method and application thereof

The invention relates to a fluorine-containing amino imine nickel complex as well as a preparation method and application thereof. The structural formula of the complex is shown as a formula (I). The nickel complex provided by the invention is used as a catalyst to catalyze ethylene homopolymerization or ethylene and polar olefin copolymerization to generate polyolefin with adjustable molecular weight and branching degree. A series of fluorine-containing amino imine nickel catalysts are designed and synthesized, a plurality of fluorine atoms not only can have hydrogen-bond interaction with beta-H of a polymeric chain, but also can easily form intramolecular hydrogen bonds with amino hydrogen (NH-C), so that the metal catalyst is stabilized. The catalyst can efficiently catalyze ethylene homopolymerization or ethylene and polar monomer copolymerization in a wide temperature range to obtain a polyolefin material with high molecular weight and medium branching degree. Meanwhile, the catalyst can effectively incr