Molecular, Cluster, and Solid State Lanthanide Compounds With Electropositive Ligands

该奖项由无机，生物无机和有机化学计划支持的研究博士约翰G。Brennan，Rutgers大学化学系，对镧系元素（Ln）分子，簇和固态材料的合成和表征进行全面的研究，这些材料与更具正电性的硫属元素（E = S，Se，Te）直接键合。 分子，团簇和固体的物理性质之间的关系将被确定，重点放在理解如何属性演变为系统维度的函数。 将开发导致分子、团簇和固态材料容易相互转化的合成方法。 这些化合物作为化学试剂是令人感兴趣的，因为Ln-Te（R）键很容易被破坏。 待开发的第二个领域是具有特别有用的含硒离去基团的Ln化合物的合成，其还赋予在簇化学中有用的甲苯溶解性。 最后，还针对具有硒配体的挥发性Ln化合物。 这些研究的目的是提供一个了解如何的化学和物理性质的Ln化合物演变的粒度的函数。这个多学科项目将为本科生和研究生提供广泛的材料合成和表征技术，并要求学生考虑实验设计的实际和智力贡献。 这项研究通过提供一种全新的潜在的刘易斯酸催化剂、还原剂或聚合引发剂而对有机化学产生影响。 所提出的化合物也是将Ln离子掺杂到硫族半导体或玻璃中的有用来源，这在平板显示器和光纤的制造中具有重要意义。 该化学品也可以作为一种低温（因此成本低）方法开发，以获得环境可接受的红橙色颜料，从而减少对Cd/Hg基材料的需求。

This award by the Inorganic, Bioinorganic and Organometallic Chemistry program supports research by Dr. John G. Brennan, Department of Chemistry, Rutgers University to undertake a comprehensive investigation into the synthesis and characterization of lanthanide (Ln) molecules, clusters, and solid-state materials with direct bonds to the more electropositive chalcogens ( E = S, Se, Te). Relationships between the physical properties of molecules, clusters, and solids will be determined, with an emphasis placed on understanding how properties evolve as a function of system dimensionality. Synthetic methods leading to facile interconversion of molecular, cluster, and solid-state materials will be developed. These compounds are of interest as chemical reagents because the Ln-Te(R) bond is so readily disrupted. A second area to be developed is the synthesis of Ln compounds with particularly useful selenium-containing leaving groups, which also impart toluene solubility that is useful in cluster chemistry. Finally, volatile Ln compounds with selenium ligands are also targeted. These studies are designed to provide an understanding of how the chemical and physical properties of Ln compounds evolve as a function of particle size. This multidisciplinary project will provide undergraduate and graduate students with a broad exposure to materials synthesis and characterization techniques and requires students to consider both practical and intellectual contributions to experimental design. This research impacts on organic chemistry by providing a totally new class of potential Lewis acid catalysts, reducing agents, or polymerization initiators. The proposed compounds are also useful sources for doping Ln ions into chalcogenido semiconductors or glasses, which have important implications in the manufacture of flat panel displays and optical fibers. The chemistry can also be developed as a low temperature (and thus low cost) approach to environmentally acceptable red-orange pigments that reduce the demand for Cd/Hg based materials.