An unsymmetric 2

6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature

aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47 ×106gPE·mol-1·Fe·h-1 at 40℃ with aluminum/iron molar ratio = 2500.A dependence of catalyst activity on the methylaluminoxane(MAO) concentration and reaction temperature was found.The molecular weight (MW) of polythylene with broad dispersity is about 104-105g/mol.The melting temperature and branching of polyethylenes vary with changing reaction temperature and aluminum/iron molar ratio.