[2π+2π] Cycloaddition of Isocyanates to Uranium(IV) Imido Complexes for the Synthesis of U(IV) κ(2)-Ureato Compounds.

Title [2π+2π] Cycloaddition of Isocyanates to Uranium(IV) Imido Complexes for the Synthesis of U(IV) κ(2)-Ureato Compounds.
Authors Tatebe, C.J.; Zeller, M.; Bart, S.C.
Journal Inorg Chem
DOI 10.1021/acs.inorgchem.6b02547
Abstract

A new family of uranium(IV) imido complexes of the form Tp*2U(NR) (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate; R = benzyl (Bn), para-tolyl (p-Tol), 2,6-diethylphenyl (detp), and 2,6-diisopropylphenyl (dipp)) have been generated by bibenzyl extrusion from Tp*2UBn. Tp*2U(NBn), Tp*2U(Np-Tol), and Tp*2U(Ndetp), along with previously reported Tp*2U(NPh) and Tp*2U(NAd) (Ad = 1-adamantyl), readily undergo [2π+2π] cycloaddition with isocyanates and isothiocyanates to generate κ(2)-ureato and κ(2)-thioureato derivatives, respectively. These new uranium(IV) complexes were characterized via multinuclear NMR, vibrational and electronic absorption spectroscopies, and, where possible, X-ray crystallography. The steric demands of the ligands were quantitatively assessed using computational modeling, and it was shown that cycloaddition only occurs for imido species where ligands occupy 90% or less of the coordination sphere.

Citation Tatebe, C.J.; Zeller, M.; Bart, S.C..[2π+2π] Cycloaddition of Isocyanates to Uranium(IV) Imido Complexes for the Synthesis of U(IV) κ(2)-Ureato Compounds..

Related Elements

Uranium

92 U 238.028910000 Uranium

See more Uranium products. Uranium (atomic symbol: U, atomic number: 92) is a Block F, Group 3, Period 7 element. The number of electrons in each of Uranium's shells is 2, 8, 18, 32, 21, 9, 2 and its electronic configuration is [Rn] 5f3 6d1 7s2. In its elemental form uranium's CAS number is 7440-61-1. The uranium atom has a radius of 138.5.pm and its Van der Waals radius is 186.pm. Uranium is harmful both through its radioactivity and chemical toxicity. Uranium in its depleted and unenriched forms has numerous commercial applications due to its great density and its bright yellow-green color in glass and ceramics. Uranium Bohr ModelIts great density has found military applications in armor piercing armaments and in protective shielding. It is added to ceramic frits, glazes and to color bars for glass production because of its bright yellow shade. Uranyl Nitrate and Uranyl Acetate are used in medical and analytical laboratories. Uranium was discovered by Martin Heinrich Klaproth. The name Uranium originates from the planet Uranus. Uranium occurs naturally in soil, rock and water and is commercially extracted from uranium-bearing minerals.

Publish your research on the American Elements website