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High-valent technetium fluorides. Does TcF7 exist?

Sebastian Riedel1, Manuel Renz, Martin Kaupp

  • 1Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

Inorganic Chemistry
|June 16, 2007
PubMed
Summary
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Quantum chemical calculations suggest technetium heptafluoride (TcF7) is a stable compound, potentially the first heptafluoride in the 4d series. Synthesis challenges may be overcome using gas-phase or matrix-isolation techniques.

Area of Science:

  • Inorganic Chemistry
  • Quantum Chemistry
  • Computational Chemistry

Background:

  • Technetium chemistry, particularly in high oxidation states, remains underexplored.
  • The synthesis of highly fluorinated technetium compounds presents significant challenges.

Purpose of the Study:

  • To investigate the structures and stabilities of technetium fluorides in high oxidation states.
  • To assess the feasibility of synthesizing technetium heptafluoride (TcF7).

Main Methods:

  • Density Functional Theory (DFT) at the B3LYP level.
  • Coupled-Cluster (CCSD(T)) calculations.

Main Results:

  • Technetium heptafluoride (TcF7) is predicted to be a stable compound.

Related Experiment Videos

  • The [TcF6]+ cation shows thermochemical stability against gas-phase elimination.
  • TcF7 would be the first heptafluoride in the 4d transition metal series.

    • Conclusions:

    • The existence and preparation of TcF7 are computationally supported.
    • Synthetic challenges likely stem from condensed-phase conditions.
    • Gas-phase or matrix-isolation techniques are recommended for future synthesis attempts.