Synthesis And Characterization Of Amorphous Rare-Earth Coordination Polymer Submicron Spheres

Coordination polymers are formed by the coordination of organic ligands and metal ions. They show an infinite network structure with a high degree of regularity. Researchers have been working on this field for decades. The coordination sphere plays an important role in all kinds of coordination polymers. The controllable morphology and structure and the unique structural properties, good thermal stability and many other characteristics make it receive much attention in the field of materials chemistry, biochemistry, structural chemistry and so on. It makes the research in the field of coordination sphere become more and more popular.At the same time, the development of rare earth materials, which is called "the gold of twenty-first Century ", is extremely rapid. Rare earth element has a lot of unpaired electrons in the inner 4f orbit, the electronic structure is rich, energy level transition is huge, as result of the unique properties of light, electricity, and magnetic and so on. Submicron-materials have the characteristics of both submicron-materials and rare earth elements after turning the rare earth material into submicron size. The rare earth coordination polymer materials with spherical structure possess the characteristics of both coordination polymers and rare earth elements. Therefore, the rare earth coordination sphere has a variety of applications, such as solar cell, biological marker, catalytic and fluorescent powders. It is possible to replace the traditional luminescent materials as a new type of material. Therefore, the design and synthesis of a single or multicomponent rare earth coordination spheres with a certain function has become a hot research area. More and more researchers are working on it. But to achieve the expectations, the following factors plays a crucial role, firstly, the particles size need to be controlled within a certain range. Secondly, the dispersity of the particles should be good. Thirdly, The distribution of elements in a multicomponent system should be uniform. Lastly, The synthesis method is simple and easy to operate. Through the unremitting efforts of the former people, a variety of practical methods have been known to the world. But the control of particle size and dispersity still needs to be improved, and the synthetic route is complicated, there is a lot of room for improvement.In this paper, base on the solvothermal process, we successfully synthesized the Core-shell Neodymium(III) Coordination Polymer Spheres by a novel and simplified synthesis route, and a series of Rare-Earth coordination polymer spheres and multicomponent rare earth coordination spheres were synthesized in the same or similar route and their properties were further studied as follows:1.The Oxalic Acid and Iso-phthalic Acid have been used as ligands to coorperate with Neodymium(III) nitrate hexahydrate to synthesize submicron-sized Core-shell amorphous Coordination Polymer Spheres during the solvothermal process, the Core-shell structure of the as-collected samples were characterized by TEM. The obtained Core-Shell structure were heated at 500C° in furnace to prepare the Neodymium(III) oxide Yolk-Shell spheres and also characterized by TEM, the element distribution of the York-shell particles determined by TEM mapping elemental analysis. The X-ray powder diffraction curves can be well indexed to the Nd2O3.2.We still used the Oxalic Acid and Iso-phthalic Acid as ligands to coorperate with a series of Rare-Earth nitrate to synthesize corresponding Amorphous Rare-Earth Solid Coordination Polymer Spheres with the best ratio. Using the same or similar method,we also synthesized multicomponent rare earth coordination spheres.