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Uranium(IV) imidazolin-2-iminato complexes: a new class of actinide complexes
Isabell S R Karmel1, Mark Botoshansky, Matthias Tamm
1Schulich Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion-Israel Institute of Technology , Technion City 32000 Israel.
Abstract:
Acid-base reactions between imidazolin-2-imines (Im(R)NH) and [U(NMeEt)4] selectively afforded uranium(IV) imidazolin-2-iminato complexes of the type [U(NIm(tBu))4] (1), [U(NIm(Mes))3(NMeEt)] (2), and [U(NIm(Dipp))2(NMeEt)2] (3) depending on the steric demand of the substituents in the 1 and 3 positions of the imidazole heterocycle (R = tBu, Mes, Dipp). This new class of actinide complexes displays short U-N bonds and nearly linear U-N-C bond angles, suggesting a U-N bond order higher than 1, as well as extraordinarily high catalytic activity in the polymerization of ε-caprolactone.
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