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Li3UHO3: A Uranium Hydride Oxide.

Marvin Michak1, Kurt Weber1, Paul Sicher1

  • 1Faculty of Chemistry, Institute of Inorganic Chemistry and Crystallography, Leipzig University, Johannisallee 29, Leipzig 04103, Germany.

Inorganic Chemistry
|July 10, 2026
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Scientists synthesized Li₃UHO₃, the first uranium hydride oxide, using a salt-flux method. This discovery expands heteroanionic hydride chemistry into actinide elements.

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Area of Science:

  • Solid-state chemistry
  • Inorganic chemistry
  • Materials science

Background:

  • Uranium oxides are well-studied, but uranium hydride oxides remain largely unexplored.
  • Heteroanionic chemistry, involving multiple types of anions, offers pathways to novel materials.
  • Understanding the structural and bonding properties of actinide compounds is crucial for fundamental science.

Purpose of the Study:

  • To synthesize and characterize the first crystallographically defined uranium hydride oxide (oxyhydride).
  • To investigate the crystal structure and bonding in the novel compound Li₃UHO₃.
  • To explore the extension of heteroanionic hydride chemistry into the actinide series.

Main Methods:

  • Salt-flux reaction of uranium dioxide (UO₂) with lithium hydride (LiH) at 973 K.
  • Single-crystal X-ray diffraction for structural determination.
  • ¹H/⁷Li Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) and CHN elemental analysis for confirmation of hydride incorporation.

Main Results:

  • Successful synthesis of Li₃UHO₃, a brown, air-sensitive solid.
  • Determination of a novel rocksalt structure variant (space group *Pm*3*m*) with ordered oxide and hydride anions.
  • Analysis revealed edge-sharing [LiH₂O₄] and [UO₆] octahedra with distinct Li-O and Li-H bond lengths, indicating weaker hydride coordination.

Conclusions:

  • Li₃UHO₃ is the first crystallographically characterized uranium hydride oxide, establishing a new class of actinide materials.
  • The compound exhibits a unique structure with ordered heteroanionic arrangement, extending known rocksalt variations.
  • This work successfully incorporates hydride anions into actinide chemistry, paving the way for further exploration of heteroanionic hydride compounds.