The Chemistry of Organosamarium (II) and Related Complexes

William J. Evans博士，加州大学尔湾分校化学系，受化学系无机、生物无机和有机金属化学项目的支持，致力于定义和开发利用有机钐（II）和相关配合物的特殊性质的新型化学和化学转化。该项目的总体目的是扩大镧系化学的范围，并开发新的反应和试剂。利用十甲基samarocene中存在的四面体反应腔，可以发展碳-氢金属化、碳-碳偶联等尺寸选择性烃类反应。利用Sm（II）的还原能力，可以裂解能量高达215 kJ/mol的主基团-碳键。这一性质将被用来生产含有主基团簇的不寻常化合物。然后，这些研究将扩展到各种额外的Sm（II）物种，以便将这种氧化态的化学过程系统化。金属化合物被用来影响许多化学转变。虽然许多金属的重要性已经得到了很好的确立，但有一类金属，称为镧系元素，其化学性质还没有很好地发展，尽管在过去几年中已经出现了一些诱人的重要行为暗示。在这个项目中，将评估一系列钐化合物激活碳氢化合物和破坏碳与其他元素之间键的能力。这将有助于全面了解镧系金属，并有助于发现钐的新用途，钐是一种在美国很容易获得的廉价金属。

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.