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The crystal and molecular structure of pyridine-2,6-dicarboxylatodioxouranium(VI) monohydrate
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1975
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Inorganic ChemistryCrystal StructureUoz-pdc UnitEngineeringAdjacent Uo2-pdc UnitSingle Pdc UnitNatural SciencesMolecular BiologyStructure ElucidationOrganic ChemistryMolecular ComplexMain Group ChemistryCoordination PolymerChemistryCrystallographyCrystal Structure DesignStructural Biology
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=26 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.