Synthesis, Characterization And Properties Of Several New Schiff Base Ligands

In the past twenty years, Organic Light Emitting Devices have been widelystudied in the display technology research field which were considered the most hopeto replace LCD and become one of the next generation of flat panel displaytechnology.Schiff Base Ligands and complexes as a typical ligands have manyexcellent performance in the metal coordination chemistry especially inelectroluminescent field and in light of organic field,for example such as highefficiency fluorescent quantum properties;good carrier transmission function;goodsemiconductor performance;good thermal stability and chemical stability; easy toform dense amorphous membrane and hard to change over time to and so on.There are three parts to be included in this paper:（1） On the chapter （I）, this paper respectively synthesized six new aryl pyrazoleSchiff Base Ligands（NCH（PhOH）,SEtNCH（PhOH）,SEtNCH（Ph）, SEtNCH（PhNO₂）,SEtNCH（FuO））. The structures of all compounds have been fully characterized byFT-IR,¹H NMR, MS and element analysis. The electronic absorption and fluorescentproperties of the objective compounds have been investigated. The experimental datesuggests that they have correct construction and good conjugate structure which aregood electroluminescence polymer. Again, the synthesis of four aryl pyrazolederivatives have advantages of raw materials with low cost, mild reaction conditions,simple work-up procedure and high field of each step,so that they have higherindustrial utilization value.（2） On the chapter （Ⅱ）, this paper respectively synthesized two new SchiffBase Ligands（phenNCHoxph, phenNCHoxNCHphen） for the matrix of1,10-Phenanthroline monohydrate.Because of ligands could control molecular shinefrequency and molecular luminous intensity through ligands strength rigid, the sizeof the conjugate system, substituents types and so on,so that we respectivelysynthesized phenNHCH2ox which flexibility is stronger than phenNCHoxph andphenNCHoxNCHphen. This lays the foundation for designing and developing newmetal complexes which have better luminous property application prospect.（3） On the chapter （Ⅲ），this paper respectively synthesized three new shrinkage ofsingle Schiff Base Ligands（5-APT-OH、5-APT-NO₂、5-APT-COOH） for the matrixof1,10-Phenanthroline monohydrate,and then, we have synthesized three new kindsof ternary Eu complexes which use the above ligands as second ligand and use acacas first ligand. All the target compounds are characterized and identified by methods of IR, NMR, mass spectrometry and elemental analysis. We also have studied theirphotophysical properties. Experimental results show that such Schiff Base Ligandshave strong absorption in the ultraviolet area and Eu complexes have more strongabsorption After the center Eu （Ⅲ） combining the ligand, complexes to uv lightabsorption degree enhanced with the increase of the conjugate strength in benzene-ring. Spectral data show that these complexes have very strong fluorescenceemission peak at610～620nm.So that we can say they are good red light materialsbecause of electric dipole⁵D0�'⁷F₂transition of Eu³⁺. In addition， fluorescenceemission peak of all this kind of Eu complexes remain unchanged whatever structureof ligands change.