In order to promote the thermostability of α-diimine nickel complex by ligand backbone structure, a series of α-diimine nickel complexes with substituents on acenaphthequinone backbone were synthesized and used as catalysts for ethylene polymerization. When the hydroxyethyl phenoxyl group was introduced to the acenaphthequinone-backbone, the thermal stability and activity of the catalyst could be significantly improved. The catalytic activity of complex C2 [5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-diisopropyl)acenaphthylene-1,2-diimine]nickel(II) dibromide with isopropyl substituents on N-aryl reached 8.2 × 10⁶ g/(mol_Ni·h) at 70 °C and 2 MPa. The activity of [5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-dibenzhydryl-4-menthylphenyl)acenaphthylene-1,2-diimine]nickel(II) dibromide (C3) still maintained at 6.7 × 10⁵ g/(mol_Ni·h) at 120 °C. Compared with C3 containing bulky dibenzhydryl substituents, the activity of C2 was sensitive to the change of the polymerization pressure. However, the polyethylenes obtained from complex C3 had lower branching density. Meanwhile, the molecular weight could reach 971 kg/mol, which is almost 5 times as much as that of the polyethylene obtained from complex C2.

为了促进的热稳定性α二亚胺镍通过配体骨架结构复杂，一系列的α二亚胺镍络合物与上acenaphthequinone骨架的取代基的合成和作为催化剂用于乙烯聚合。当将羟乙基苯氧基引入到ena醌骨架上时，可以显着提高催化剂的热稳定性和活性。络合物的催化活性C2 [5-（4-（2-羟乙基）苯氧基） - ñ，ñ -双（2,6-二异丙基）苊-1,2-二亚胺]镍（II）与异丙基溴化取代基Ñ -芳基达到8.2×10 ⁶ g /（mol _Ni·h）在70°C和2 MPa下。的活性[5-（4-（2-羟乙基）苯氧基） - N，N-双（2,6-二dibenzhydryl -4- menthylphenyl）苊-1,2-二亚胺]镍（II）二溴化物（C3）仍然在120°C下保持在6.7×10 ⁵ g /（mol _Ni ·h）。与含有大体积二苯甲酰基取代基的C3相比，C2的活性对聚合压力的变化敏感。然而，从配合物C3获得的聚乙烯具有较低的支化密度。同时，分子量可以达到971kg / mol，几乎是从络合物C2获得的聚乙烯的分子量的5倍。