title: Uranium(IV) imidazolin-2-iminato complexes: a new class of actinide complexes.
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.
authors.affiliation: Schulich Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion-Israel Institute of Technology , Technion City 32000 Israel.
authors.forename: Isabell S R
authors.initials: IS
authors.lastname: Karmel
authors.forename: Mark
authors.initials: M
authors.lastname: Botoshansky
authors.forename: Matthias
authors.initials: M
authors.lastname: Tamm
authors.forename: Moris S
authors.initials: MS
authors.lastname: Eisen