The Synthesis Of Metal Salen Complexes

Studies have found out that complexes contain electron-withdrawing substituents,thus beneficial to the stability of catalyzers.The current researches mainly focus on salicylaldehyde in the structural changes of Salen Complexes.As for diamine,researches generally adopt chiral ethylenediamine or chiral ring adipic amine,while there is relatively less literature reference about o-phenylenediamine as diamine.The substituent group is mainly a transformation of electron-withdrawing substituents as well.This paper aims at synthesizing a series of new Salen-Metal Complexes that contain electron-withdrawing substituents.The experiment adopts o-phenylenediamine and 4-(diethylamino)salicylaldehyde as raw materials.It synthesizes 4 kinds of transitional metal complexes through condensation reaction and coordination of ligand with metal salts.Then it analyzes the structural characteristics of the compound structure through NMR and ESI-MS methods.During the process of synthesizing ligands,toluene is adopted as solvent and azeotropic distillation of water facilitates the condensation reaction.The ultrasonic oscillation approach is adopted for purification after the experiment,which is convenient and efficient.When conducting the coordination reaction between ligands and metal salt,oven dry DMF is adopted as solvent.After the stirring in room temperature,the complexes are obtained.In addition,this paper mainly studies the quantification reaction between ligands and metal-Salen complexes.To synthesize metal Salen complexes with strong electron-withdrawing substituents,the ligands synthesized in the experiment and the explorations throughout the experiment provide reference for further researches.