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Related Experiment Videos

Dimeric uranyl complexes with bridging perrhenates.

Gordon H John1, Iain May, Mark J Sarsfield

  • 1Centre for Radiochemistry Research, School of Chemistry, The University of Manchester, Manchester M13 9PL, UK.

Dalton Transactions (Cambridge, England : 2003)
|April 12, 2007
PubMed
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Uranium complexes with perrhenates and phosphine oxides/phosphates form dimers, revealing a novel bridging coordination for perrhenate. This provides insights into actinide chemistry and PUREX process solvent interactions.

Area of Science:

  • Coordination chemistry
  • Actinide chemistry
  • Nuclear fuel cycle chemistry

Background:

  • Uranium(VI) chemistry is crucial for nuclear fuel reprocessing.
  • Understanding perrhenate coordination is key to modeling PUREX process solvent behavior.

Purpose of the Study:

  • To synthesize and characterize novel uranium complexes with perrhenate and phosphine oxide/phosphate ligands.
  • To investigate the coordination modes of perrhenate with uranyl ions.
  • To provide insights into potential pertechnetate species in PUREX solvents.

Main Methods:

  • Synthesis of uranyl perrhenate complexes with tri-n-butyl phosphine oxide (TBPO) and tri-iso-butyl phosphate (TiBP).
  • Crystallization and X-ray diffraction analysis of dimeric and monomeric complexes.

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  • Characterization using vibrational and absorption spectroscopy (solid-state and solution).

    • Main Results:

    • Formation of dimeric complexes [UO2(mu2-ReO4)(ReO4)(TBPO)2]2 and [UO2(mu2-ReO4)(ReO4)(TiBP)2]2 with bridging perrhenates.
    • Pentagonal bipyramidal coordination geometry at each uranium center.
    • Identification of a monomeric complex [UO2(ReO4)2(H2O)(TiBP)2] with monodentate perrhenate.
    • Spectroscopic evidence for coordinated perrhenate and ligands in solution.

    Conclusions:

    • First structural evidence for bridging perrhenate coordination to an actinide.
    • The study elucidates the coordination chemistry of uranyl perrhenate complexes.
    • Findings contribute to understanding solvent phase speciation in the PUREX process.