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Related Experiment Videos

Reductions by titanium(II) as catalyzed by titanium(IV).

Ritam Mukherjee1, Zhiyong Yang, Edwin S Gould

  • 1Department of Chemistry, Kent State University, Kent, Ohio 44242, USA.

Dalton Transactions (Cambridge, England : 2003)
|January 27, 2006
PubMed
Summary

The reduction of cobalt(III) complexes by titanium(II) shows unique kinetics. The reaction rate is primarily governed by the slow ligand exchange between titanium(IV) and titanium(II) species.

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Area of Science:

  • Inorganic Chemistry
  • Chemical Kinetics

Background:

  • Cobalt(III) complexes are reduced by titanium(II) solutions.
  • The reaction kinetics exhibit unusual linear profiles, deviating from typical exponential decay.

Purpose of the Study:

  • To investigate the reaction mechanism and kinetics of cobalt(III) reduction by titanium(II).
  • To determine the rate-determining step and relative reduction rates of different cobalt(III) complexes.

Main Methods:

  • Kinetic studies of cobalt(III)-titanium(II) reactions.
  • Computer simulations to model reaction pathways in perchlorate-triflate media.

Main Results:

  • Observed nearly linear reaction profiles for specific cobalt(III) complexes, becoming curved near completion.

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  • Identified a biphasic catalyzed reaction sequence involving titanium(IV)-titanium(II) ligand exchange as the rate-limiting step (k1 = 9 x 10(-3) M(-1) s(-1)).
  • Determined the relative reduction rate constant ratio k(Br)/k(I) = 8 for the active titanium(II) intermediate.

    • Conclusions:

    • The reduction kinetics are significantly influenced by the titanium(IV)-titanium(II) ligand exchange.
    • The proposed reaction mechanism accurately simulates the observed kinetic behavior.