The Chemistry of Organosamarium (II) and Related Complexes

加州大学欧文分校化学系William J.Evans博士在化学部无机化学、生物无机化学和有机金属化学计划的支持下，定义和开发新型的化学和化学转化，利用有机汞(II)和相关络合物的特殊性质。该项目的总体目的将是扩大稀土化学的限制，并开发新的反应和试剂。利用十甲基三甲基二茂铁中存在的四面体反应空穴，将开发C-H金属化、C-C偶联等尺寸选择性碳氢化合物反应及其他新型反应。利用Sm(II)的还原能力，可以裂解能量高达215kJ/mol的主族碳键。这一性质将被用来生产含有主族簇合物的不寻常化合物。然后，这些研究将扩展到各种额外的Sm(II)物种，以便系统化这种氧化态的化学。金属化合物被用来实现许多化学变化。虽然许多金属的重要性已经得到了很好的证实，但有一类被称为镧系元素的金属的化学成分并不发达，尽管在过去几年里出现了一些诱人的重要行为的迹象。在这个项目中，将评估一系列钐化合物活化碳氢化合物和打破碳与其他元素之间的键的能力。这将有助于对稀土金属的全面了解，并有助于发现美国现成的一种廉价金属--钐的新用途。

Dr. William J. Evans, Chemistry Department, University of Califonia-Irvine, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program of the Chemistry Division to define and develop new types of chemistry and chemical transformations which exploit the special properties of organosamarium(II) and related complexes. The project's general purpose will be to expand the limits of lanthanide chemistry and to develop new reaction and reagents. By utilizing the tetrahedral reaction cavity which exists in decamethylsamarocene, size selective hydrocarbon reactions such as C-H metalations, C-C coupling and other novel reactions will be developed. Using the reducing power of Sm(II), main group-carbon bonds with energies as high as 215 kJ/mol can be cleaved. This property will be utilized to produce unusual compounds containing main group clusters. These studies will then be extended to a variety of additional Sm(II) species in order to systematize the chemistry of this oxidation state. Metal compounds are used to effect many chemical transformations. While the importance of many metals has been well established, there is a group, called the lanthanides, whose chemistry is not well developed, even though tantalizing hints of important behaviors have emerged over the past few years. In this project the ability of a series of samarium compounds to activate hydrocarbons and to break bonds between carbon and other elements will be assessed. This will contribute both to the overall understanding of the lanthanide metals and to the discovery of new uses for samarium, which is an inexpensive metal readily available in the United States.