Uranium(VI) Bis(imido) Chalcogenate Complexes: Synthesis and Density Functional Theory Analysis
摘要:
Bis(imido) uranium(VI) trans- and cis-dichalcogenate complexes with the general formula U((NBu)-Bu-t)(2)(EAr)(2)(OPPh3)(2) (EAr = O-2-(BuC6H4)-Bu-t, SPh, SePh, TePh) and U((NBu)-Bu-t)(2)(EAr)(2)(R(2)bpy) (EAr = SPh, SePh, TePh) (R(2)bpy = 4,4'-disubstituted-2,2'-bipyridyl, R = Me, Bu-t) have been prepared. This family of complexes includes the first reported monodentate selenolate and tellurolate complexes of uranium(VI). Density functional theory calculations show that covalent interactions in the U-E bond increase in the trans-dichalcogenate series U(NtBu)(2)(EAr)(2)(OPPh3)(2) as the size of the chalcogenate donor increases and that both 5f and 6d orbital participation is important in the M-E bonds of U-S, U-Se, and U-Te complexes.
UI
3
(1,4-dioxane)
1.5
and UI
4
(1,4-dioxane)
2
, were synthesized in high yield by reacting turnings of elemental uranium with iodine dissolved in 1,4-dioxane under mild conditions. These molecular compounds of uranium are thermally stable and excellent precursor materials for synthesizing other molecular compounds of uranium including alkoxide, amide, organometallic, and halide compounds.
UI<sub>4</sub>(1,4-dioxane)<sub>2</sub>, [UCl<sub>4</sub>(1,4-dioxane)]<sub>2</sub>, and UI<sub>3</sub>(1,4-dioxane)<sub>1.5</sub>: Stable and Versatile Starting Materials for Low- and High-Valent Uranium Chemistry
作者:Marisa J. Monreal、Robert K. Thomson、Thibault Cantat、Nicholas E. Travia、Brian L. Scott、Jaqueline L. Kiplinger
DOI:10.1021/om200093q
日期:2011.4.11
The uranium(III) and uranium(IV) iodide complexes UI3(1,4-dioxane)1.5 and UI4(1,4-dioxane)2 have been easily prepared in high yield by reacting uranium turnings with a 1,4-dioxane solution of iodine under mild conditions. The two complexes exhibit outstanding thermal stability and are excellent precursors to a variety of uranium(III), uranium(IV), and uranium(VI) alkoxide, amide, organometallic, and
Exploring the coordination modes of pyrrolyl ligands in bis(imido) uranium(vi) complexes
作者:Douglas L. Swartz II、Liam P. Spencer、Brian L. Scott、Aaron L. Odom、James M. Boncella
DOI:10.1039/c002440f
日期:——
The preparation of a family of bis(imido) uranium(VI) complexes stabilized by mono- and bidentate pyrrolyl ancillary ligands is described. X-ray crystallographic studies of dipyrrolylmethane (dpm) derivatives show that the pyrrolyl coordination mode in these uranium(VI) ions is unexpected in comparison to analogous transition metal and lanthanide chemistry. The ability of the coordinated pyrrolyl moieties to undergo pyrrolyl isomerization has also been explored and demonstrates reactivity that is unique from structurally similar uranium(VI)-bis(cyclopentadienyl) derivatives.
Imido Exchange in Bis(imido) Uranium(VI) Complexes with Aryl Isocyanates
作者:Liam P. Spencer、Ping Yang、Brian L. Scott、Enrique R. Batista、James M. Boncella
DOI:10.1021/ja7107454
日期:2008.3.1
U(NtBu)2(I)2(OPPh3)2 yields the aryl−imido complexes U(NAr)(NtBu)(I)2(OPPh3)2 and U(NAr)2(I)2(OPPh3)2, respectively. Unlike analogous transition metal reactions this imido exchange reaction does not proceed through a metal oxo intermediate. Density functional theory calculations and 15N-labeling studies suggest this transformation involves the [2 + 2] cycloaddition of the aryl isocyanate CN bond across the UN imido