Isolation of an Americium Complex Containing a Radical Ligand

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Abstract
The synthesis, characterization, and electronic structure of Cp*2Am(tBu2bipy•–) (1-Am) (Cp* = pentamethylcyclopentadienide; tBu2bipy = 4,4′-di-tert-butyl-2,2′-bipyridine), the first isolated and structurally verified americium complex containing a radical ligand, is reported. Theoretical calculations (DFT and multiconfigurational methods) alongside experimental comparisons of M–N distances reveal a greater degree of metal–ligand covalency in 1-Am compared to near-isoradial lanthanide counterparts 1-Nd and 1-Sm. Electrochemical studies suggest that 1-Am may behave as an “Am(II) synthon”, and a preliminary attempt to probe the chemical reactivity of 1-Am is briefly discussed.
Funding Information
  • Los Alamos National Laboratory (DE-AC52-06NA25396)
  • Laboratory Directed Research and Development

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