Crystal structure of a trigonal polymorph of aqua-dioxidobis(pentane-2,4-dionato-κ2 O,O')uranium(VI)
Alejandro Hernandez1, Indranil Chakraborty1, Gabriela Ortega1
1Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th St., Miami, FL 33199, USA.
Abstract:
The title compound, [UO2(acac)2(H2O)] consists of a uran-yl(VI) unit ([O=U=O]2+) coordinated to two monoanionic acetyl-acetonate (acac, C5H7O2) ligands and one water mol-ecule. The asymmetric unit includes a one-half of a uranium atom, one oxido ion, one-half of a water mol-ecule and one acac ligand. The coordination about the uranium atom is distorted penta-gonal-bipyramidal. The acac ligands and Ow atom comprise the equatorial plane, while the uranyl O atoms occupy the axial positions. Inter-molecular hydrogen bonding between complexes results in the formation of two-dimensional hexa-gonal void channels along the c-axis direction with a diameter of 6.7 Å. The monoclinic (P21/c space group) polymorph was reported by Alcock & Flanders [(1987). Acta Cryst. C43, 1480-1483].
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