Crystal structure of dioxidobis(pentane-2,4-dionato-κ(2) O,O')[1-phenyl-3-(pyridin-4-yl)propane-κN]uranium(VI) (original) (raw)
Related papers
Acta Crystallographica Section E Crystallographic Communications, 2016
In the title compound, [U(C13H9N4O)(NO3)O2(H2O)]·CH3CN·H2O, the UVIatom is seven-coordinated in a distorted pentagonal–bipyramidal N2O5manner by one tridentate triazole ligand, one monodentate nitrate anion and one water molecule in the equatorial plane and by two uranyl(VI) O atoms in the axial positions. In the crystal, the UVIcomplex molecule is linked to the water and acetonitrile solvent molecules through N—H...N, O—H...O and O—H...N hydrogen bonds, forming a sheet structure parallel to thebcplane. The sheets are further linked by an additional O—H...O hydrogen bond, forming a three-dimensional network.
Molecular and crystal structure of bis(N-cyclohexyl-2-pyrrolidone)dioxouranium(VI) nitrate
Inorganica Chimica Acta, 2003
Bis(N -cyclohexyl-2-pyrrolidone)dioxouranium(VI) nitrate, UO 2 (NO 3 ) 2 (NCP) 2 , has been prepared by mixing UO 2 (NO 3 ) 2 ×/6H 2 O and N -cyclohexyl-2-pyrrolidone (NCP) in an aqueous nitric acid solution and characterized by NMR, IR spectroscopy, and single crystal X-ray diffractometry. The IR spectrum is consistent with typical absorption bands observed in other UO 2 (NO 3 ) 2 ×/2L complexes (L 0/unidentate oxygen donor ligand), and supports that NCP molecule coordinates to uranium through carbonyl oxygen. The 15 N NMR spectrum shows that two structural isomers of the complex exist in inert solvents such as CD 2 Cl 2 . X-ray diffraction study reveals that average distances between uranium atom and uranyl-, nitrate-, and carbonyl-oxygen atoms are 1.748, 2.527, and 2.347 Å , respectively. #
Crystal and molecular structure of uranyl acetylacetonate dimer, [UO2(C5H7O2)2]2
Radiochemistry, 2009
The crystal and molecular structure of uranyl acetylacetonate dimer was determined by single crystal X-ray diffraction. The compound crystallizes in the tetragonal system, a = 7.9420(2), c = 40.1240(13) Å (at 100 К), Z = 4, space group P4 1 2 1 2. Dimeric uranyl acetylacetonate molecules in the crystal are formed by bridging bonding of one of O atoms of the acetylacetonate ligands with U atoms, so that the coordination polyhedra of U atoms (distorted pentagonal bipyramids) share a common equatorial edge. The dimer has a nonplanar structure, being significantly bent along the conventional line connecting the bridging O atoms.
The crystal and molecular structure of pyridine-2,6-dicarboxylatodioxouranium(VI) monohydrate
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1975
The structure has been determined by three-dimensional X-ray counter techniques. The complex crystallizes in the hexagonal space group P6x, Z= 6, a=b= 14.685 (2), e=9-313 (1)/~, Dc,~c= 2.60, Dobs=2"6 gcm -3. Full-matrix least-squares treatment of 890 observed intensities gave an unweighted R value of 0.033. The linear uranyl group coordinates a single PDC unit as a tridentate equatorial ligand through nitrogen and two oxygen atoms; each UOz-PDC unit is linked through one of its carboxylic oxygen atoms to an adjacent UO2-PDC unit, thus giving rise to a polymeric structure. The water molecule is also coordinated to uranium to give coordination number 7. The polymer crystallizes with helices having the same sense linked together by hydrogen bonding between coordinated water and free C=O groups. The space inside the helices is unfilled and forms a tunnel along the length of the polymer.
Acta crystallographica. Section E, Crystallographic communications, 2015
In the title dimeric complex, [{UO2(NO3)(C15H11N3)}2O2], a peroxide ion bridges the two uran-yl(VI) [O=U=O](2+) ions. The O-O bond length of the peroxide is 1.485 (6) Å and the mid-point of this bond is located at the inversion centre of the dimer. The U atom exhibits a distorted hexa-gonal-bipyramidal coordination geometry with two uran-yl(VI) O atoms occupying the axial positions and one O atom of the monodentate nitrate ion, both O atoms of the peroxide ion and the three N atoms of the chelating tridentate 2,2':6',2''-terpyridine (terpy) ligand in the equatorial positions. Two of the N atoms of the terpy ligand lie above and below the mean plane containing the equatorial ligand atoms and the U atom [deviations from the mean plane: maximum 0.500 (2), minimum -0.472 (2) and r.m.s. = 0.2910 Å]. The dihedral angle between the terpy ligand and the mean plane is 35.61 (7)°. The bond lengths around the U atom decrease in the order U-N > U-Onitrate > U-Operoxo > ...