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Related Experiment Videos

The curium aqua ion.

S Skanthakumar1, Mark R Antonio, Richard E Wilson

  • 1Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. Skantha@anl.gov

Inorganic Chemistry
|April 5, 2007
PubMed
Summary
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The coordination environment of the hydrated curium(III) ion (Cm3+) was studied in solid and solution states. Cm3+ maintains a nine-water coordination sphere in both states, with subtle differences observed in aqueous solution.

Area of Science:

  • Coordination Chemistry
  • Actinide Chemistry
  • Solution Chemistry

Background:

  • The coordination environment of f-ions, such as curium (Cm), is crucial for understanding their chemical behavior.
  • Previous studies suggest a decrease in coordinating waters with decreasing ionic radius for f-ions in solution.

Purpose of the Study:

  • To determine the coordination environment of the hydrated Cm3+ ion in both solid and aqueous solution states.
  • To compare the solid-state structure with the solution structure and investigate the factors influencing coordination number.

Main Methods:

  • Single-crystal X-ray diffraction for solid-state analysis.
  • High-energy X-ray scattering and extended X-ray absorption fine structure (EXAFS) spectroscopy for solution studies.

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Main Results:

  • The solid-state structure of [Cm(H2O)9](CF3SO3)3 reveals a tricapped-trigonal-prismatic geometry with nine coordinating waters.
  • Cm3+ in aqueous solution also exhibits a nine-water coordination sphere, similar to the solid state.
  • A greater splitting of Cm-O bond distances in the first coordination shell was observed in solution compared to the solid state.

Conclusions:

  • The hydrated Cm3+ ion maintains a nine-water coordination sphere in both solid and solution phases.
  • The increased distance splitting in solution may relate to the observed decrease in coordinating waters with decreasing ionic radius for f-ions.