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Title: Mononuclear to Polynuclear U(IV) Structural Units: Effects of Reaction Conditions on U-Furoate Phase Formation

Journal Article · · Chemistry - A European Journal
ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Georgetown Univ., Washington, DC (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. Georgetown Univ., Washington, DC (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Florida State Univ., Tallahassee, FL (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

In this work, Uranium(IV) complexation by 2-furoic acid was examined to better understand the effects of ligand identity and reaction conditions on species formation and stability. Five compounds were isolated: [UCl2(2-FA)2(H2O)2]n (1), [U4Cl10O2(THF)6(2-FA)2]•2(THF) (2), [U6O4(OH)4(H2O)3(2-FA)12]•7(THF)•(H2O) (3), [U6O4(OH)4(H2O)2(2-FA)12]•8.76(H2O) (4), and [U38Cl42O54(OH)2(H2O)20]•m(H2O)•n(THF) (5). The structures were determined by single crystal X-ray diffraction and further characterized by Raman, IR, and optical absorption spectroscopy. The thermal stability and magnetic behavior of the compounds were also examined. Variations in the synthetic conditions led to notable differences in the structural units observed in the solid state. At low H2O/THF ratios, a tetranuclear oxo bridged [U4O2] core was isolated. Aging of this solution resulted in the formation a U38 oxo cluster capped by chloro and water ligands. However, at increasing water concentrations only hexanuclear units were observed. In all cases, at temperatures of 100-120 °C, UO2 nanoparticles formed.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
89233218CNA000001; SC0019190; SC0017259; SC0010677
OSTI ID:
1814777
Report Number(s):
LA-UR--19-32690
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 26 Vol. 26; ISSN 0947-6539
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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