报告: William J. Evans
Department of Chemistry
University of California, Irvine
Irvine, CA 92697-2025, USA
One of the fundamental aspects of the chemistry of any element is the number of oxidation states that are available to do productive chemistry in molecular complexes. This feature is so critical to the chemistry of each element that the limits of oxidation states have been probed extensively for decades. The redox tables of textbooks summarize the well-established results. Surprisingly, in the past few years, the landscape of redox chemistry for the rare-earth metals and the actinides has changed substantially. Molecular complexes containing new oxidation states have been discovered which appear to have a new type of electron configuration. By 2016, studies of these unexpected new oxidation states led to a coherent set of generalizations that explained the synthetic and structural bases of their discovery. This talk will describe the new oxidation state chemistry and show how the generalizations need to be modified as the redox chemistry of these metals continues to evolve.