Ethylene Polymerization Using Site-Selective Pyridine-Amide Based Iron Complexes

摘要

The ligand N’,N’-bis(6-chloropyridin-3-yl)pyridine-2,6-dicarboxamide(1)in their di-deprotonated forms have been used to synthesize two new iron(III)2 and 3 metal complexes.The iron(III)is surrounded by two tridentate ligands for complex 2,and one tridentate ligand for complex 3.Both complexes have been characterized by NMR,UV-Visible,IR spectroscopy and elemental analysis.The solid-state structure of 2 was determined by X-ray diffraction analysis.Both iron complexes were further studied for ethylene polymerization in the presence of co-catalyst methylaluminoxane(MAO)under various reaction conditions.It was found that the pincer containing complex 3 exhibited good activities for ethylene polymerization at 80°C,while the bis-ligated iron complex 2 did not show activity for ethylene polymerization.