Synthesis, Characterization, And Properties Of Organometallic Schiff Base Complexes

Schiff-base complexes are in a wide rang of application in catalysis, analysis, corrosion, agricultural, marine, medicine, pesticides, and industrial areas as one of the most important forefront academiac aera. In this paper, synthesis, characterization and luminescent properties of Schiff-base and their metal complexes were investigated. Based on the detailed investigation of related literature, our work was carried out as followed:(1) We have choosen Salicylaldehyde and Tert-butyl phenol as raw materials and five heterocyclic substituted salicylaldehyde were synthesized by a series of reactions, such as Formaldehyde, Bromination and Suzuki reactions. Also, we have obtained one crystal and characterized by X-ray diffraction. All of the five compounds were characterized by NMR, IR, MS and melting point..(2) The condensation between each of the five salicylaldehyde we have obtained and Tris(2-aminoethyl) amine or ethylenediamine with selection led to seven Schiff base compounds and two of them H₂L²,H₃L³ were crystals and characterized by X-ray diffraction. All of the seven Schiff-base were characterized by NMR, IR, MS ,melting point, UV-visible and fluorescence spectra and the results show that all of the Schiff-base ligands have certain luminescence.(3) Then forty Schiff-base compounds were obtained form the seven Schiff-base with transition metals or lanthanide metals and also one Cu complexes Cu(â…¡)L² and Ho complexes Ho(â…¢)L³ crystal were obtained. The two crystals were characterized by X-ray diffraction and all of the forty Schiff-base complexes were characterized by NMR, IR, MS, melting point, UV-visible. Parts of the complexes were characterized by fluorescence spectra the results show that the Zn complexes could be used as potential luminescent materials and all of the Schiff base ligands can excitate part the lanthanide ions to luminescent at near-infrared regions (NIR) and the luminescent mechanism of those bimetallic complexes was confirmed.