Understanding the Ligand-Directed Assembly of a Hexanuclear ThIV Molecular Cluster in Aqueous Solution



The electrochemical hydrolysis of thorium(IV) was monitored by a combination of high-energy X-ray scattering (HEXS) and NMR spectroscopy. Once formed, μ2-dihydroxo-bridged dimers remain stable in solutions of moderate pH until glycine is added, upon which the dimers rapidly condense to form hexanuclear clusters [Th63-O)43-OH)4]12+. In the absence of the dimers or glycine, the clusters do not form even if the solutions are stored over extended times.