Sodium N,N-dimethylaminodiboranate, Na(H3BNMe2BH3), is a new type of chelating borohydride ligand that forms many interesting complexes with actinides and lanthanides. Among these are Th(H3BNMe2BH3)4, in which the thorium center forms bonds with fifteen hydrogen atoms; accordingly, this is the first example of a fifteen-coordinate metal complex of any kind. Single crystal X-ray neutron diffraction studies, as well as quantum chemical calculations will be described.  Uranium forms the trivalent complex U(H3BNMe2BH3)3, which has been crystallized as two different structural isomers from pentane and toluene, respectively. It forms the Lewis base adducts U(H3BNMe2BH3)3(thf), U(H3BNMe2BH3)3(dme), and U(H3BNMe2BH3)3(PMe3)2.  We also will describe recent results on the synthesis of thorium complexes of the borohydride, including the first example of a sixteen coordinate metal complex of any kind.

New actinide aminodiboranates and borohydrides

243rd National Meeting (2012)

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