Actinide solid-state structural chemistry has played an important role in our understanding of the chemical and physical behavior of the actinides. As an example, isomorphism in the AnO<sub>2</sub> series of compounds along with the systematic decrease in ionic radii was one of the factors upon which G. T. Seaborg proposed the “actinide concept.” Still today, actinide solid-state structural chemistry continues to highlight important differences in the chemistry of the 4f and 5f elements, inform our understanding of variations that arise from trends in periodicity, and uncover fundamental insight that is critical to understanding the bonding and reactivity of heavy elements. Motivated by both the utility of structural chemistry and ongoing needs to control and predict the behavior of actinides under chemically complex conditions, our group has sought to further elucidate the factors that govern the formation and precipitation of actinide complexes and clusters from aqueous solution. In this talk, the role that solution conditions, ligand complexation, and counter-ion identity have on tetravalent actinide species formation, stability, and reactivity will be discussed.

Tetravalent actinide solid-state structural chemistry

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