Research On The Catalytic Properties Of Heterocyclic Amine Complexes

Recently,with the rapid development of coordiation chemistry and catalytic chemistry,catalytic reactions with the use of complexes have been reported frequently.Moreover,the recycling process of renewable resource and environmental protection have been paid more attention.Therefore,synthesis of propylene carbonate by carbon dioxide reactions and ethylene oligomerization reactions have been put a high value for researchers.CO2 has led to global greenhouse effect,but it was the most abundant and widely distributed carbon resources.From the perspectives of resource utilization and atmospheric protection,carbon dioxide are turned into chemical products by chemical reactions,which is of great significance.?-Olefins are widely used in many areas as chemical intermediate for the production of lubricants,drilling fluids,plasticizers and other additives.In this study,eight complexes bearing different crystal structures,have been prepared by the reaction of two ligands with different inorganic metal salt respectively,which were characterized by elemental analysis,infrared spectroscopy,Ultraviolet spectroscopy,thermogravimetric analysis and single crystal X-ray diffraction.Furthermore,study on the catalytic properties of these complexes.2,6-bis[(1-phenylimine)methyl] pyridine(L1)and 2,6-bis [1-(4-methoxy-2-methylphenyl imine)methyl]pyridine(L2)were synthesized by using 2,6-diacetylpyridine and aniline.With the reaction of ligand(L1)and ligand(L2)with metal salts respectively,chromium,manganese,copper metal complexes were synthesized.Furthermore,these complexes were characterized by IR,UV-vis spectroscopy and TG-DSC.And,the crystal structure of these complexes have been determined by X-ray single crystal diffraction.The catalytic properties of the synthesis of propylene carbonate by carbon dioxide reactions was studied at the reaction conditions of 2MPa,100?,and 150 min.The complexes(2?4~7)showed good catalytic performance(over80%).The catalytic properties of ethylene oligomerization were tested at 3 MPa,60? and n(Al): n(M)=800.The complexes(4 ? 7)showed high catalytic performance,the catalytic activity reached 2.51×107g/(mol·h),2.27×107g/(mol·h),respectively.