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Equilibrium Dynamics in the Thallium(III)-Cyanide System in Aqueous Solution.

István Bányai1, Julius Glaser, Judit Losonczi

  • 1Department of Inorganic Chemistry, The Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden, and Department of Physical Chemistry, Lajos Kossuth University (KLTE), H-4010 Debrecen Pf. 7, Hungary.

Inorganic Chemistry
|October 24, 2001
PubMed
Summary

Thallium(III) cyano complexes exhibit ligand exchange dominated by self-exchange reactions, with a common rate-determining step involving breaking the stable Tl-CN bond. Anation reactions are rapid, contrasting with slower halide exchange processes.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Chemical Kinetics

Background:

  • Thallium(III) cyano complexes, Tl(CN)n(3-n), are studied in aqueous solution.
  • Previous studies focused on thallium(III) halide complexes.
  • Understanding ligand exchange mechanisms is crucial for inorganic reaction pathways.

Purpose of the Study:

  • To systematically investigate ligand exchange reactions of thallium(III) cyano complexes.
  • To determine rate constants for dominant exchange pathways.
  • To compare cyanide ligand exchange with previously studied halide complexes.

Main Methods:

  • Utilized (205)Tl and (13)C Nuclear Magnetic Resonance (NMR) one-dimensional inversion transfer techniques.
  • Conducted experiments in a controlled aqueous solution with a 4 M ionic medium at 25°C.

Related Experiment Videos

  • Analyzed self-exchange, anation, and ligand substitution reactions.

    • Main Results:

    • Ligand exchange is primarily driven by self-exchange reactions between thallium(III) cyano complexes.
    • Cyanide exchange rate constants are significantly slower (100-1000 s⁻¹) than halide exchanges, indicating Tl-CN bond breaking as the rate-determining step.
    • Anation reactions are very fast (approx. 10⁹ M⁻¹s⁻¹) and proceed via an associative interchange mechanism.

    Conclusions:

    • The breaking of the stable thallium-cyanide bond is the common rate-determining step for self-exchange reactions.
    • This contrasts with thallium(III)-halide systems where Tl-OH₂ bond breaking dictates the rate.
    • Self-exchange dominates due to low free cyanide concentration and inertness of HCN.