Some Aspects of Structure and Bonding in Binary and Ternary Uranium(VI) Oxides

King, R. Bruce

doi:10.1021/cm020258j

Cited by 35 publications

(28 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The compound crystallizes in the tetragonal I4/m space group with a=7.5172(1)Å and c=4.6325(2)Å. Our unit cell parameters are in agreement with those reported previously (a=7.536Å and c=4.630Å) [2,4,7,28], albeit not as precise as our values of a=7.5172(1)Å and c=4.6325(2)Å. The uranium is located in an octahedral coordination environment, while the sodium is found in a distorted square pyramidal coordination environment.…”

Section: Resultssupporting

confidence: 89%

“…The potassium monouranate, K 2 UO 4 , crystallizes in the K 2 NiF 4 structure type, in the tetragonal space group I4/mmm with a=4.3321(1)Å and c= 13.1382(7)Å and is isostructural with other tetraoxouranates such as Li 2 UO 4 and Na 2 UO 4 [7]. The oxide has previously been prepared as a powder with lattice constants reported as a =4.335Å and c =13.13Å [8,9], consistent with those obtained from our single crystal X-ray diffraction study, albeit not as precise as our values of a= 4.3321(1) and c= 13.1382(7).…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that uranium can take on different oxidation states in oxides and, hence, many research groups have investigated the synthesis, characterization and physical property measurements of diverse complex uranium oxides [1][2][3][4][5][6]. Both title compounds, K 2 UO 4 and Na 4 UO 5 , have been studied as part of such general investigations of uranium oxides [2,4,[7][8][9]. In these studies, the oxides were synthesized as polycrystalline powders using solid-state routes, although carbonate melts have been considered as synthetic media [6,10,11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal growth of K2UO4 and Na4UO5 using hydroxide fluxes

Roof

Smith

Loye

2010

Journal of Crystal Growth

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crystal growth of K2UO4 and Na4UO5 using hydroxide fluxes

Roof

Smith

Loye

2010

Journal of Crystal Growth

View full text Add to dashboard Cite

“…be tiled exclusively with regular pentagons. 5 Two U=O bonds are located in the axial position. Their lengths, as expected for 7-coordinate uranyl complexes.…”

mentioning

confidence: 99%

Crystal Structure of a Novel Polymer of Dioxo tetrakis(.MU.-dimethyl-phosphato) Dimethyl-sulfoxide Uranium(VI) Complex, C6H18P2O11SU

Rafizadeh¹,

Hoseinzadeh²,

Amani³

2006

Anal. Sci. X

View full text Add to dashboard Cite

A large number of metal complexes with a variety of central atoms, such as d-block transition metals and lanthanides, 1 incorporating various types of phosphate moieties, are applied to investigate cleavage of phosphate ester bonds in order to interpret the importance of these interactions in biological systems.Polymeric heterometallic complexes have been reported in which the phosphate moieties adopt monodentate, chelating and bridging dispositions. 3 Recently we studied the coordination chemistry of a novel polymeric UO2 complex, in which each unit consists of one uranyl, where the U atom is connected to four bridging DMP ligands and one DMSO. Preparation: The title compound was obtained from the reaction between a solution of UO2(NO3)2 with trimethyl phosphate in a 1:2 molar ratio and dimethyl sulfoxide. Slow evaporation of this solution resulted in prismatic yellow crystals after three weeks.The X-ray data were collected on a diffractometer (Mo Kα radiation, graphite monochromator) at 120(2)K. The crystal data and experimental parameters are given in Table 1.The non-hydrogen atoms were refined anisotropically, and all hydrogen atoms were located from sequent difference fourier The crystal structure of [UO2(µ-DMP)4(DMSO)]n, (DMP = dimethyl phosphate), (DMSO = dimethyl sulfoxide), has been determined by the X-ray diffraction method. This polymeric complex crystallizes in the orthorhombic system, space group P212121, with four molecules per unit cell. The unit cell dimensions are a = 8.8085(13)Å, b = 11.8499(17)Å, c = 15.359(2)Å, V = 1603.2(4)Å 3 . The final R value is 0.035 for 13322 measured reflections. In this complex, a distorted pentagonal bipyramidal coordination is located around the central U atom. There are two oxygens of uranyl at the axial position, four oxygen atoms of four bridging DMP ligands and one oxygen atom of DMSO are in the equatorial position. The phosphorous atom in the bridging DMP is arranged in a deformed tetrahedron skeleton with a simultaneously Z-in, Zout distortion, and the phosphate methyl esters have gt conformer (gauche, trans).

show abstract

“…The DMSO molecule appears as a monodentate ligand in every single U atom, different from the behavior of DMSO in the [Cu2(µ-DMP)4DMSO]n complex. 4 The related U(1)-O(21) bond to DMSO is relatively longer than the other equatorial bonds. The large mentioned angle may belong to the steric hindrances induced by the methyl groups of DMSO, and lone pairs on the oxygen of DMSO with the U atom environment.…”

mentioning

confidence: 99%