Studies On The Synthesis And Luminescence Property Of The Schiff Base And Its Metal Complexes

Recently, considerable interest has been focused on the research of organic electroluminescent device because of its characteristics such as the low energy consumes, the excellent luminescent properties and fast response speed, the luminescent materials were very important in this technology. Among the luminescent materials, the metal complexes with schiff base as ligand could be a kind of excellent luminescent material because they can fit with the conditions of charge balance and saturated coordination number.The synthesis of schiff base is relatively easy, ethylenediamine and o-phenylenediamine schiff bases have been widely studied. Though the crystal structure of hydrazine hydrate with salicyaldehyde shiff base has been reported in the literature, the luminescenct properties of hydrazine hydrate schiff bases have not been reported. In this thesis, schiff base ligands were synthesized by liquid phase using hydrazine hydrate with salicylaldehyde, cinnamaldehyde, glyoxal, and furfural and benzoyl chloride. The results showed that only salicylaldehyde with hydrazine hydrate schiff base ligand has strong yellow emission by examining the ligands with three-phase ultraviolet instrument. The reaction conditions of salicylaldehyde with hydrazine hydrate schiff base were investigated in detail. The ligand was reacted with Mg²⁺, Ba²⁺, Cu²⁺, Zn²⁺, Al³⁺, Eu³⁺ and Y³⁺, similarly, and the complexes were examined by the three-phase ultraviolet instrument. Only the zinc complex of hydrazine hydrate with salicylaldehyde was observed with the strong yellow-green emission. The reaction conditions of zinc and salicylaldehyde with hydrazine hydrate were discussed in detail to obtain the optimum conditions. Salicylaldehyde with hydrazine hydrate schiff base and the related zinc complex were characterized by ICP, IR, 1HNMR, TG-DTA and FL. The results show that the structure of synthetic products are consistent with the target products and the ligand has strong yellow emission with the peak at 535nm, while the related zinc complex has strong yellow green emission with the peak at 521nm, and different reaction conditions will not affect the fluorescence properties of the ligand and its zinic complexes. They are expected to be an organic electroluminescent material with good luminous property performances.