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Poly[diammonium [diaqua(μ 7 -benzene-1,2,3,4,5,6-hexacarboxylato)tetraoxidodiuranium(VI)]]

Journal Article · · Acta Crystallographica. Section E
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Uranyl-carboxylate hybrid materials dominate the catalog of uranyl compounds owing in part to the affinity between COO-functional groups and UO22+. Polycarboxylate organic ligands may present a degree of steric hindrance and could thus influence the resulting uranyl topology. Single crystals of the title compound, {(NH4)2[(UO2)2(C12O12)(H2O)2]}n, were synthesized hydrothermally as a result of reacting uranyl nitrate with benzene-1,2,3,4,5,6-hexacarboxylic acid (mellitic acid). The structure is comprised of a single unique monomeric uranyl cation adopting a pentagonal bipyramidal geometry. The uranyl coordination sphere is composed of four O atoms originating from one half of a fully deprotonated mellitic acid ligand and a single water molecule. The observed axial U—O bonds display an average distance of 1.765 (8) Å, whereas equatorial O atoms are found at an average distance of 2.40 (5) Å. All uranium–oxygen bond lengths are in good agreement with literature values. Furthermore, the coordination between the uranyl pentagonal bipyramids and the mellitic acid anion constructs a three-dimensional anionic framework which is charge-balanced with ammonium cations. Additional stabilization of the structure is provided by O—H...O and N—H...O hydrogen bonding interactions between the components.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
SC0001089
OSTI ID:
1385699
Journal Information:
Acta Crystallographica. Section E, Journal Name: Acta Crystallographica. Section E Journal Issue: 4 Vol. 70; ISSN ACSEBH; ISSN 1600-5368
Publisher:
International Union of Crystallography
Country of Publication:
United States
Language:
English

References (17)

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Synthesis, structure and fluorescent studies of novel uranium coordination polymers in the pyridinedicarboxylic acid system journal January 2006

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
nuclear (including radiation effects)
materials and chemistry by design
synthesis (novel materials)
synthesis (self-assembly)