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Dimorphism and isomorphism of zirconium(IV), cerium(IV), thorium(IV) and uranium(IV) acetylacetonates
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1959
Year
Crystal StructureEngineeringMolecular BiologyBeta ModificationsComputational ChemistryChemistryInorganic MaterialAlpha ModificationLinear Chain CompoundInorganic CompoundStructure ElucidationMaterials ScienceInorganic ChemistryPhysicsBeta ModificationQuantum ChemistryCrystallographyCrystal Structure DesignNatural SciencesSynthetic Element
The lattice constants for Zr(IV), Ce(IV), U(IV), and Th(IV) acetylacetonates were measured. Th(IV) acetylacetonate is dimorphic. The modifications are both monoclinic but have different unit cells and space groups, i.e., P2i/sub 1//c for the alpha modification and C2/c for the beta modification. Ce(IV) and U(IV) acetylacetonate occur in the same modification with lattice parameters very close to those of the Th compound. For Zr(IV) acetylacetonate only the beta modifications has been observed, with the lattice parameters very close to those of the beta modification of the Th comopound. The space group C2/c necessitates 1-bar or 2 as the lowest molecular symmetry. Results are tabulated. (J. E.D.)