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Uranyl Peroxide Capsule Self-assembly in Slow Motion Ana Arteaga,1 Lei Zhang,2 Sarah Hickam,2 Mateusz Dembowski,2,3 Peter C. Burns 2 and May Nyman1*

Journal Article · · Chemistry - A European Journal
 [1];  [2];  [2];  [2];  [2];  [3]
  1. Oregon State Univ., Corvallis, OR (United States). Dept. of Chemistry; University of Notre Dame
  2. Univ. of Notre Dame, Notre Dame, IN (United States). Dept. of Civil and Environmental Engineering and Earth Sciences
  3. Oregon State Univ., Corvallis, OR (United States). Dept. of Chemistry
Uranyl-peroxide capsules are the newest family of polyoxometalates. Although discovered 13 years prior with over 70 topologies reported, we lack fundamental understanding of assembly mechanisms, particularly the role of the alkali countercations. Herein, we report the reaction pathway and assembly of uranyl peroxide capsules by tracking the conversion from K+ uranyl triperoxide monomer to the K+ uranyl-peroxide U28 capsule via Small Angle X-Ray Scattering and Raman Spectroscopy. For the first time, the K+ uranyl-peroxide pentamer face is isolated and structurally characterized, giving credence to the long-held belief that these geometric faces serve as building blocks to the fully formed capsules. Once isolated and redissolved, the pentamer face undergoes rapid conversion to capsule forms, underlining its high reactivity that challenges its isolation. Calorimetric measurements of the studied species confirms the pentamer lies on the energy landscape between the monomer and capsule.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
NA0003763
OSTI ID:
1502931
Alternate ID(s):
OSTI ID: 1503928
OSTI ID: 22972097
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 24 Vol. 25; ISSN 0947-6539
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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