Nanometer Sized Rare Earth Chalcogenide Clusters: Synthesis,Characterization, and Chemical Reactivity Studies

/他的奖项由材料合成和加工倡议下的化学司特别项目办公室颁发。本研究将探讨分子态、胶体态和固态稀土硒化物和碲化物性质之间的关系。为了了解稀土配位化学中键合的基本方面，新的有机稀土化合物将被制备和表征。为了研究这些半导体材料独特的光学和磁性，这些化合物将在低温下热分解成纳米级簇和固态化合物。稀土纳米团簇将通过核磁共振和透射电子显微镜进行表征，以记录大小相关结构，电子和磁性质的演变。一旦这些材料的基本性质被概述，负责团簇稳定性和粒度分布的化学性质就可以确定。稀土硫族化合物的这种低温方法可能提供分离亚稳态固体化合物的可能性，这些化合物无法承受传统固态合成的高温。

/his award is made by the Office of Special Projects in the Chemistry Division under the Materials Synthesis and Processing Initiative. This research will explore the relationships between the properties of molecular, colloidal and solid state rare earth selenides and tellurides. New organo-rare earth compounds will be prepared and characterized in order to understand the fundamental aspects of bonding in rare earth coordination chemistry. These compounds will be thermolyzed at low temperatures into both nanometer-sized clusters and solid state compounds in order to examine the unique optical and magnetic properties of these semiconducting materials. Rare earth nanoclusters will be characterized by NMR and transmission electron microscopy to document the evolution of size-dependent structural, electronic and magnetic properties. Once the fundamental properties of these materials have been outlined, the chemical properties responsible for cluster stability and particle size distribution can be determined. %%% This low temperature approach to rare earth chalcogenides may afford the possibility of isolating metastable solid state compounds which would be unable to withstand the high temperatures associated with conventional solid state synthesis.