Preparation And Characterization Of Neodymium Complexes Of Trifluoroacetic Acid

Laser materials are the core and fundamental technology in the development of laser technology. Laser technology has a profound impact on the national economy, national defense, science and technology and our daily life. Scientists have long been committed to the development of new laser materials in order to obtain more perfect lasers owing to the limited performances of the traditional lasers. Rare-earth complexes liquid laser materials have excellent optical properties of rare-earth solid laser materials and the advantages of self-repair function and flowing-heat management and have become an important research direction in the laser materials. Based on the above viewpoints, this thesis conducted the following work.In the first chapter, the laser technology and its principle are introduced and the recent progress of rare-earth complexes as liquid luminescent materials is summarized. The evaluation methods for the optical properties of the materials are introduced and finally the research contents and their significance are given.In the second chapter, six novel neodymium complexes with trifluoroacetate as first ligand and a N-or O- donor ligand as second ligand, were synthesized. The new complexes were characterized by thermogravimetric analysis, FT-IR spectroscopy, photoluminescence spectroscopy and two complexes Nd(CF3COO)3 and Nd(CF3COO)3·(Ph3PO)2 were additionally characterized by single-crystal X-ray diffraction. The crystal structures, bond lengths, and bond angles of the two compounds were thus obtained. The TG curves revealed that the new complexes have good thermal stability, with decomposition temperatures more than 200℃ and the maximum weight loss higher than 260 ℃. Some complexes were tested by Z-scan experiments to get the nonlinear optical properties of the materials. Based on the UV-VIS-NIR absorption spectra of the new compounds, Judd-Ofelt intensity parameters Ωt(t= 2,4,6) were calculated and the calculated results provides theoretical support for potential applications of the materials.In the final chapter, all the research work was summarized.