2 research outputs found
[UIII{N(SiMe2tBu)2}3]: A Structurally Authenticated Trigonal Planar Actinide Complex
We report the synthesis and characterization of the uranium(III) triamide complex [U(III)(N**)(3)] [1, N**=N(SiMe(2)tBu)(2)(â)]. Surprisingly, complex 1 exhibits a trigonal planar geometry in the solid state, which is unprecedented for three-coordinate actinide complexes that have exclusively adopted trigonal pyramidal geometries to date. The characterization data for [U(III)(N**)(3)] were compared with the prototypical trigonal pyramidal uranium(III) triamide complex [U(III)(Nâ)(3)] (Nâ=N(SiMe(3))(2)(â)), and taken together with theoretical calculations it was concluded that pyramidalization results in net stabilization for [U(III)(Nâ)(3)], but this can be overcome with very sterically demanding ligands, such as N**. The planarity of 1 leads to favorable magnetic dynamics, which may be considered in the future design of U(III) single-molecule magnets