Synthesis Of Imine Ligands And Complexes With Multilocus Structure

Polyethylene materials still play an important role in the development of the modern society. Nearly decades, the demand of polyethylene still continue growing. The domestic industry of polyolefin area is developing steadily. Compared with the developed countries in the global, there is a certain gap in the area of technology level. In the process of synthesis of polyolefin material, catalyst plays an important role, it is the essence of the technology. In recent years, the Late-Transition-Metal metal catalyst with its unique properties caused a large number of researchers’ interests. This article is based on the two formation of imine legends has reported, using novel and special reaction characteristics of lithium reagent as raw materials synthese Late-Transition-Metal complexes which have new structure Ab1 ~Ab3.This type of complexes used the 1,4-diiodine-1,3-butadiene derivatives which has been synthesed to produce 2,4-diene-1,6-dials.Treatment of the dials reagents with different kinds of aniline resulted in the formation of corresponding Schiff base. Obtained imine substance used as Late-Transition-Metal catalyst ligand. In order to conform the fomation, we used 1H NMR,GC,IR and some other tools to test them. As well as investigating the new structure of the ligand, we use more simple original substance, that is isophthalaldehyde, to synthese another type of complexes. This process also use the same aniline. And have gotten different structural legends Bb1~Bb3.These afforded six substance reacted with NiBr2(DME) to generate new Late-Transition-Metal complexes. Used with alkyl aluminum as co-catalyst, these catalysts were added to the reactor to make ethylene polymerise. We researched the influence of the different experiment conditions such as polymerization temperature, co-catalysts and molar ratios of Al/Ni on catalytic activities. Polymerization kinetics which are similar to other LTM catalysts were discovered. In the experiments, we found that the 1st type catalyst(A) reacted at 40℃,the molar ratios of Al/Ni was 2000,its polymerization activities can reach highland the 2nd type catalyst(B) reacted at 30℃,the molar ratios of Al/Ni was 1500,It could perform well. The polymers of these two type catalysts, most are the oligomers. Also, there was a little high molecular weight polymer. Compared with the GC sample, the results confirmed that the oligomers mainly consisted of C8~C12 olefin.