The speciation of actinides is known to play an important role in understanding the fate of radionuclides under separations, nuclear waste management, and environmental conditions. Both solution and solid-state investigations of actinides-halides, in particular, have been foundational to understanding the complexes that exist within these scenarios, as well as discerning covalency of the 5f-block. Yet, the impact that outer coordination sphere interactions may have on the speciation and stability of actinide-halides is relatively unexplored. In this work, we have examined the formation and composition of tetravalent thorium and uranium chloride complexes and clusters isolated from acidic aqueous solutions containing non-coordinating hydrogen-bond donor molecules. The role that solution conditions and the presence of H-bond donors including carboxylic acids and pyridinium derivatives have on Th(IV) and U(IV) speciation will be discussed.<br/>

Th(IV)- and U(IV)- chlorides isolated from acidic aqueous media

254th National Meeting (2017)

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