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Controlling Ligand Exchange through Macrocyclization.

Veronica Carta1, S Hessam M Mehr1, Mark J MacLachlan1

  • 1Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , British Columbia V6T 1Z1 , Canada.

Inorganic Chemistry
|March 1, 2018
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Summary
This summary is machine-generated.

Macrocyclization of ligands impedes ligand exchange at sterically hindered palladium centers. This study investigated ligand exchange rates in a palladium complex, revealing how macrocycle cavity size influences guest exchange dynamics.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Supramolecular Chemistry

Background:

  • Palladium complexes are crucial in catalysis and materials science.
  • Steric hindrance around metal centers significantly impacts reactivity.
  • Macrocyclic ligands offer unique structural and electronic properties.

Purpose of the Study:

  • To investigate ligand exchange kinetics at a sterically hindered palladium center.
  • To compare ligand exchange rates in a macrocyclic complex versus its open-form analog.
  • To understand the influence of macrocycle cavity size on guest exchange dynamics.

Main Methods:

  • Synthesis of a square-planar palladium complex with a tridentate NNN pincer bis(amido)pyridine macrocycle.
  • Kinetic studies of ligand exchange using six different ligands.
  • Comparison of exchange rates between the macrocyclic complex and its open form.

Main Results:

  • Ligand exchange at the hindered palladium center proceeds via an associative mechanism.
  • The rate of ligand exchange is impeded by the constrained metallomacrocycle cavity.
  • Macrocyclization effectively modifies the guest exchange rate in square-planar metal complexes.

Conclusions:

  • Macrocyclization is a viable strategy to tune the reactivity of metal complexes.
  • The steric environment within a macrocycle plays a critical role in controlling ligand substitution.
  • Understanding these dynamics is key for designing novel catalysts and functional materials.