title: The uranium-nitrogen bond in U IV complexes supported by the hydrotris(3,5-dimethylpyrazolyl)borate ligand.
abstract: Insertion of benzonitrile and acetonitrile into the U-C bond of [U(Tp(Me2))Cl(2)(CH(2)SiMe(3))](Tp(Me2)= HB(3,5-Me(2)pz)(3)) gives the ketimide complexes [U(Tp(Me2))Cl(2){NC(R)(CH(2)SiMe(3))}](R = Ph (1); Me (2)). The identity of complex was ascertained by a single-crystal X-ray diffraction study. In the solid state exhibits octahedral geometry with a short U-N bond length to the ketimide ligand. We also report herein the synthesis and the X-ray crystal structures of the uranium amide complexes [U(Tp(Me2))Cl(2)(NR(2))](R = Et (3); Ph (4)). A detailed comparison of the U-N bond lengths in these compounds with other known U-N (and Th-N) distances in amide and ketimide actinide(IV) complexes is performed, confirming the short character of the U-N bond length in 1.
authors.affiliation: Departamento de Química, Instituto Tecnológico e Nuclear, Estrada Nacional 10, 2686-953 Sacavém, Portugal.
authors.forename: Manuela
authors.initials: M
authors.lastname: Silva
authors.forename: Maria Augusta
authors.initials: MA
authors.lastname: Antunes
authors.forename: Marta
authors.initials: M
authors.lastname: Dias
authors.forename: Angela
authors.initials: A
authors.lastname: Domingos
authors.forename: Isabel Cordeiro
authors.initials: IC
authors.lastname: dos Santos
authors.forename: Joaquim
authors.initials: J
authors.lastname: Marçalo
authors.forename: Noémia
authors.initials: N
authors.lastname: Marques