| Summary: | 碩士 === 國立中興大學 === 化學系所 === 107 === A series of novel transition metal (Ni, Co, Cu) complexes bearing S,N,O-tridentate Schiff–base ligands have been synthesized with respect to various electronic and steric effect. The results of one-pot CHO/CO2 reaction carried out with ligand precusors and transition metals infer the active species in the reaction.
The composition of complexes has been characterized by elemental analysis, FT-IR and EPR spectroscopy. Their physical properties were investigated using the melting point analyzer and UV/Vis spectroscopy. X-ray diffraction studies of the complex (1) and (3) indicate that these are pentanuclear six-coordinated nickel complexes and the studies of the complex (7) indicate that it is a dinuclear six-coordinatrd cobalt complex.
With Bu4NCl as a cocatalyst , all of the nickel complexes (1)-(3) and one-pot reaction with ligand precusors and nickel acetate show efficient activity and high selectivity in the reaction of cyclohexene oxide and carbon dioxide with similar conversion and selectivity.
Moreover, comparison of the activity in the one-pot reaction with the activity of metal complexes indicates that the synthesized pentanuclear Ni complexes, pentanuclear Cu complexes and dinuclear Co complexes are the active species of their one-pot reactions.
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