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Title: The Key Role of U 28 in the Aqueous Self‐Assembly of Uranyl Peroxide Nanocages

Journal Article · · Chemistry - A European Journal
 [1]; ORCiD logo [1]
  1. Energy Frontier Research Center Materials Science of Actinides Department of Chemistry Oregon State University Gilbert Hall Corvallis Oregon 97331 United States

Abstract For 11 years now, the structural diversity and aesthetic beauty of uranyl–peroxide capsules have fascinated researchers from the diverse fields of mineralogy, polyoxometalate chemistry, and nuclear fuel technologies. There is still much to be learned about the mechanisms of the self‐assembly process, and the role of solution parameters including pH, alkali template, temperature, time, and others. Here we have exploited the high solubility of the UO 2 2+ /H 2 O 2 /LiOH aqueous system to address the effect of the hydroxide concentration. Important techniques of this study are single‐crystal X‐ray diffraction, small‐angle X‐ray scattering, and Raman spectroscopy. Three key phases dominate the solution speciation as a function of time and the LiOH/UO 2 2+ ratio: the uranyl–triperoxide monomer [UO 2 (O 2 ) 3 ] 4− and the two capsules [(UO 2 )(O 2 )(OH)] 24 24− (U 24 ) and [(UO 2 )(O 2 ) 1.5 ] 28 28− (U 28 ). When the LiOH/U ratio is around three, U 28 forms rapidly and this cluster can be isolated in high yield and purity. This result was most surprising and challenges the hypothesis that alkali templating is the most important determinant in the cluster geometry. Moreover, analogous experiments with KOH, NH 4 OH, and TEAOH (TEA=tetraethylammonium) also rapidly yield U 28 , which suggests that U 28 is the kinetically favored species. Complete mapping of the pH–time phase space reveals only a narrow window of the U 28 dominance, which is why it was previously overlooked as an important kinetic species in this chemical system, as well as others with different counterions.

Sponsoring Organization:
USDOE
OSTI ID:
1400785
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Vol. 22 Journal Issue: 41; ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

References (59)

Direct Observation of Contact Ion-Pair Formation in Aqueous Solution journal August 2009
Uranyl−Peroxide Interactions Favor Nanocluster Self-Assembly journal November 2009
Stabilization of Tetravalent 4f (Ce), 5d (Hf), or 5f (Th, U) Clusters by the [α-SiW 9 O 34 ] 10– Polyoxometalate journal August 2015
Hybrid Uranium-Oxalate Fullerene Topology Cage Clusters journal August 2010
Solution and Solid-State Structural Chemistry of Actinide Hydrates and Their Hydrolysis and Condensation Products journal October 2012
Exploring the Programmable Assembly of a Polyoxometalate–Organic Hybrid via Metal Ion Coordination journal August 2013
Aqueous formation and manipulation of the iron-oxo Keggin ion journal February 2015
Aqueous uranium complexes. 2. Raman spectroscopic study of the complex formation of the dioxouranium(VI) ion with a variety of inorganic and organic ligands journal December 1992
Self-Assembly of Polyoxo Clusters and Extended Frameworks by Controlled Hydrolysis of Low-Valent Uranium journal October 2007
Crown and Bowl-Shaped Clusters of Uranyl Polyhedra journal December 2009
Isolation of the Large {Actinide} 38 Poly-oxo Cluster with Uranium journal October 2013
Actinyl Peroxide Nanospheres journal March 2005
The U28 Nanosphere: What's Inside? journal March 2011
Hybrid Uranium-Oxalate Fullerene Topology Cage Clusters journal August 2010
Clusters of Actinides with Oxide, Peroxide, or Hydroxide Bridges journal October 2012
On the Origin of the Cation Templated Self-Assembly of Uranyl-Peroxide Nanoclusters journal December 2010
Ex-Situ Kinetic Investigations of the Formation of the Poly-Oxo Cluster U 38 journal September 2015
Direct Observation of Contact Ion-Pair Formation in Aqueous Solution journal August 2009
Irena : tool suite for modeling and analysis of small-angle scattering journal February 2009
Alkali-metal ion coordination in uranyl( vi ) poly-peroxide complexes in solution. Part 1: the Li + , Na + and K + – peroxide–hydroxide systems journal January 2015
Evaluating Best Practices in Raman Spectral Analysis for Uranium Speciation and Relative Abundance in Aqueous Solutions journal December 2015
Actinyl Peroxide Nanospheres journal March 2005
The Structure of the Plutonium Oxide Nanocluster [Pu38O56Cl54(H2O)8]14− journal January 2008
Solution Speciation and Stability of Cobalt-Polyoxometalate Water Oxidation Catalysts by X-ray Scattering: Cobalt-Polyoxometalate Water Oxidation Catalysts journal May 2015
Structure and Solution Speciation of U IV Linked Phosphomolybdate (Mo V ) Clusters journal November 2015
A comprehensive comparison of transition-metal and actinyl polyoxometalates journal January 2012
Elucidating Self-Assembly Mechanisms of Uranyl–Peroxide Capsules from Monomers journal September 2014
Hybrid Uranium–Transition-Metal Oxide Cage Clusters journal November 2014
B-α-[AsW 9 O 33 ] 9− polyoxometalates incorporating hexanuclear uranium {U 6 O 8 }-like clusters bearing the U IV form or unprecedented mixed valence U IV /U VI involving direct U VI O–U IV bonding journal January 2015
Separation of Plutonium Oxide Nanoparticles and Colloids journal September 2011
Kinetics vs. thermodynamics: a unique crystal transformation from a uranyl peroxo-nanocluster to a nanoclustered uranyl polyborate journal January 2014
Raman Spectroscopic and ESI-MS Characterization of Uranyl Peroxide Cage Clusters journal January 2014
Symmetry versus Minimal Pentagonal Adjacencies in Uranium-Based Polyoxometalate Fullerene Topologies journal March 2009
Uranyl peroxide pyrophosphate cage clusters with oxalate and nitrate bridges journal January 2012
[Th 10 (μ-F 16 )(μ 3 -O 4 )(μ 4 -O 4 )(NH 3 ) 32 ](NO 3 ) 8 ·19.6 NH 3 - the Largest Thorium Complex from Solution known to Date : [Th journal May 2014
Low-Symmetry Uranyl Pyrophosphate Cage Clusters journal January 2011
Role of Ammonium Ions in the Formation of Ammonium Uranyl Peroxides and Uranyl Peroxo-oxalates journal November 2015
Counterion Distribution around Hydrophilic Molecular Macroanions: The Source of the Attractive Force in Self-Assembly journal August 2009
Rapid Self-Assembly of Uranyl Polyhedra into Crown Clusters journal June 2011
Self-Assembly of Alkali-Uranyl-Peroxide Clusters journal September 2010
Water-soluble multi-cage super tetrahedral uranyl peroxide phosphate clusters journal January 2014
Time-Resolved Self-Assembly of a Fullerene-Topology Core–Shell Cluster Containing 68 Uranyl Polyhedra journal January 2012
Alkali–metal ion coordination in uranyl( vi ) poly-peroxo complexes in solution, inorganic analogues to crown-ethers. Part 2. Complex formation in the tetramethyl ammonium-, Li + -, Na + - and K + -uranyl( vi )–peroxide–carbonate systems journal January 2015
A Journey inside the U28 Nanocapsule journal May 2012
Uranium Pyrophosphate/Methylenediphosphonate Polyoxometalate Cage Clusters journal September 2010
Understanding the Structure and Formation of Uranyl Peroxide Nanoclusters by Quantum Chemical Calculations journal October 2010
Symmetry versus Minimal Pentagonal Adjacencies in Uranium-Based Polyoxometalate Fullerene Topologies journal March 2009
Self-Assembly of Polyoxo Clusters and Extended Frameworks by Controlled Hydrolysis of Low-Valent Uranium journal October 2007
Complex Nanoscale Cage Clusters Built from Uranyl Polyhedra and Phosphate Tetrahedra journal June 2011
Probing protein fine structures by wide angle solution X-ray scattering journal June 2000
Separation of Plutonium Oxide Nanoparticles and Colloids journal September 2011
Nb 2 O 5 and Ta 2 O 5 Thin Films from Polyoxometalate Precursors: A Single Proton Makes a Difference journal June 2015
Uranyl Peroxide Oxalate Cage and Core–Shell Clusters Containing 50 and 120 Uranyl Ions journal January 2012
Crystallographic Computing System JANA2006: General features journal January 2014
Uranyl peroxide closed clusters containing topological squares journal January 2010
Counterion Distribution around Hydrophilic Molecular Macroanions: The Source of the Attractive Force in Self-Assembly journal August 2009
Ultrafiltration of Uranyl Peroxide Nanoclusters for the Separation of Uranium from Aqueous Solution journal December 2013
Time-Resolved Assembly of Chiral Uranyl Peroxo Cage Clusters Containing Belts of Polyhedra journal December 2012
Uranyl-Peroxide Nanocapsules: Electronic Structure and Cation Complexation in [(UO 2 ) 20 (μ-O 2 ) 30 ] 20– journal March 2012

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