Synthesis And Properties Of Transition Metal Pyridine Complexes

In this work, some new ethylene polymerization/oligomerization catalyst systems have been designed and synthesized based on Brookhart bis(imino)pyridine late transition metal catalyst. The key for designing catalyst is the design of ligand. New type pyridine-polyolefin catalysts have been obtained through modifying or changing the ligands of Brookhart bis(imino)pyridine transition metal catalysts.The main studies are as fellows:a With 2,6-pyridinedicarboxylic acid as the starting material, 2,6-pyridinedicarboxaldehyde has been synthesized through esterification, reduction and oxidation.2,6-Bis(1H-perimidin-2-yl)pyridine L1 has been obtained by 2,6-pyridine-dicarboxaldehyde and 1,8-diaminonaphthalene. And then, seven complexes have been synthesized and characterized by elemental analysis, IR, UV-Vis spectroscopy, and solid-state fluorescence spectroscopy.b The two bis(imino)pyridine ligands 2,6-bis[1-(4-methylphenylimino)]pyridine L2 and 2,6-bis[1-(4-bromophenylimino)]pyridine L3 have been synthesized by 2,6-pyridine-dicarboxaldehyde and aniline, and their transition metal complexes have also been obtained and characterized by elemental analysis, IR, and UV-Vis spectroscopy.c With L2 and L3 as ligands, respectively, six novel structure complexes have been obtained through them and transition metals during the course of the diffusion/solvothermal treatment, and they have been characterized by elemental analysis, UV-Vis spectroscopy and solid-state fluorescence spectroscopy. The structures of these complexes are determined by X-ray single crystal diffraction.