Journal article
Synthesis and Structural Characterization of Hydrolysis Products within the Uranyl Iminodiacetate and Malate Systems
Inorganic chemistry, Vol.52(17), pp.10191-10198
09/03/2013
DOI: 10.1021/ic401705j
PMID: 23957694
Abstract
The interplay of hydrolysis and chelation by organic ligands results in the formation of novel uranium species in aqueous solutions. Many of these molecular complexes have been identified by spectroscopic and potentiometric techniques, but a detailed structural understanding of these species is lacking. Identification of possible uranyl hydrolysis products in the presence of organic functional groups has been achieved by the crystallization of molecular species into a solid-state compound, followed by structural and chemical characterization of the material. The structures of three novel molecular complexes containing either iminodiacetate (ida) (Na3[(UO2)3(OH)3(ida)3]·8H2O (1)) or malate (mal) (K(pip)2[(UO2)3O(mal)3]·6H2O (2a) (pip = C4N2H12), (2b) (pip)3[(UO2)3O(mal)3]·H2O, and (pip)6[(UO2)11(O)4(OH)4(mal)6(CO3)2]·23H2O (3)) ligands have been determined by single-crystal X-ray diffraction and have been chemically characterized by IR, Raman, and NMR spectroscopies. A major structural component in compounds 1 and 2 is a trimeric 3:3 uranyl ida or mal species, but different bridging groups between the metal centers create variations in the structural topologies of the molecular units. Compound 3 contains a large polynuclear cluster with 11 U atoms, which is composed of trimeric and pentameric building units chelated by mal ligands and linked through hydroxyl groups and carbonate anions. The characterized compounds represent novel structural topologies for U6+ hydrolysis products that may be important molecular species in near-neutral aqueous systems.
Details
- Title: Subtitle
- Synthesis and Structural Characterization of Hydrolysis Products within the Uranyl Iminodiacetate and Malate Systems
- Creators
- Daniel K UnruhKyle GojdasErin FloresAnna LiboTori Z Forbes
- Resource Type
- Journal article
- Publication Details
- Inorganic chemistry, Vol.52(17), pp.10191-10198
- Publisher
- American Chemical Society
- DOI
- 10.1021/ic401705j
- PMID
- 23957694
- ISSN
- 0020-1669
- eISSN
- 1520-510X
- Language
- English
- Date published
- 09/03/2013
- Academic Unit
- Civil and Environmental Engineering; Core Research Facilities; Chemistry
- Record Identifier
- 9983985856902771
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