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A density functional study of uranyl monocarboxylates.

Florian Schlosser1, Sven Krüger, Notker Rösch

  • 1Theoretische Chemie, Department Chemie, Technische Universität München, Garching, Germany.

Inorganic Chemistry
|February 14, 2006
PubMed
Summary

This study used relativistic density functional methods to model uranium(VI) monocarboxylate complexes. Calculations show good agreement with experimental data for most bonds, but highlight discrepancies in uranyl-carboxylate bond lengths.

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Area of Science:

  • Computational Chemistry
  • Inorganic Chemistry
  • Environmental Chemistry

Background:

  • Uranium(VI) forms complexes with monocarboxylate ligands in aqueous solutions.
  • These complexes are relevant to understanding uranyl interactions with natural organic matter like humic substances.
  • Investigating coordination modes (mono- and bidentate) is crucial for characterizing these interactions.

Purpose of the Study:

  • To computationally study uranium(VI) monocarboxylate complexes, [UO2(OOCR)]+.
  • To model both mono- and bidentate coordination modes.
  • To compare theoretical calculations with experimental data, particularly EXAFS and crystal structure results.

Main Methods:

  • Relativistic density functional theory (DFT) was employed for calculations.

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  • Simple carboxylic acids (formic, acetic, propionic) were used as model ligands.
  • Explicit aqua ligands modeled short-range solvent effects, and a polarizable continuum model (PCM) handled long-range electrostatic interactions.

    • Main Results:

    • Calculated bond lengths for uranyl U=O, U-aqua ligands, and average U-Oeq distances closely matched EXAFS data.
    • The calculated uranyl-carboxylate bond length was significantly shorter than experimentally determined values.
    • Experimental differences between mono- and bidentate coordination were qualitatively reproduced for U-C distance, but not for average U-Oeq bond length.

    Conclusions:

    • Discrepancies between calculated and experimental uranyl-carboxylate bond lengths warrant further investigation.
    • Changes in coordination number, rather than coordination geometry, are proposed as the primary reason for experimentally observed variations in U-Oeq distances.
    • The study provides insights into the electronic structure and bonding of uranyl complexes relevant to environmental systems.