Synthesis,Characterization And Catalytic Activity Of Hydrazide Vanadium And Molybdenum Complexes

Nowadays,environmental promblem have become increasingly serious,and people's attention to organic synthesis,petrochemicals,and other fields has continued to increase.By using a catalyst,the energy consumption of the reaction process can be reduced,the pollution to the environment can be reduced,and the conversion rate can be improved.Vanadium complexes usually have high catalytic properties and are widely used in biomedicine,petrochemical and other fields.vanadium complexes can catalyze the selective oxidation of sulfides to sulfoxide and olefin epoxidation reactions,which solves the disadvantages of low yield and poor selectivity of these reactions.Among such catalysts,vanadyl vanadium complexes have higher stability and are used as catalysts for epoxidation and sulfonation oxidation reactions.In addition,molybdenum complexes are also an efficient catalyst and are widely used in different catalytic processes.Tridentate molybdenum complexes,for example,have been successfully used as epoxidations of olefins,oxidation of sulphides to sulphoxides,asymmetric acetylation of aldehydes,stereoselective synthesis of cyclic ethers and trimethylsilyl cyanide Reaction catalyst.In order to explore the catalytic properties of hydrazide-based vanadium and molybdenum complexes,the tridentate hydrazide ligands with good coordination performance were used in this thesis.Vanadium and molybdenum were used as center metals to prepare their complexes and their styrenes were studied for Catalytic performance.The paper is divided into the following four parts:1.The overview of vanadium and molybdenum complexes,introduces the performance and application of them.2.13 monohydrazide hydrazide vanadium complexes were prepared with hydrazide as ligands.Their composition and structure were characterized by X-ray single crystal diffraction,IR,UV and NMR.The vanadium atoms in the complexes were slightly distorted which have used octahedral coordination configuration.3.Monohydrazide molybdenum complexes were prepared with hydrazide as ligands.Their composition and structure were characterized by X-ray single crystal diffraction,IR,UV and NMR.The molybdenum atoms in the complexes were slightly distorted which have used octahedral coordination configuration.4.The styrene oxidation reaction of some complexes was tested.The influence of the amount of oxidant H2O2 and the reaction time on the catalytic process was discussed.The results showed that the complexes have good catalytic properties.