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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Related Experiment Video

Updated: Apr 15, 2026

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Catalytic catechol oxidation by copper complexes: development of a structure-activity relationship.

Erica C M Ording-Wenker1, Maxime A Siegler, Martin Lutz

  • 1Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands. bouwman@chem.leidenuniv.nl.

Dalton Transactions (Cambridge, England : 2003)
|April 15, 2015
PubMed
Summary

Copper(II) complexes were synthesized to catalyze 3,5-di-tert-butylcatechol (3,5-DTBC) oxidation. Ligands stabilizing biomimetic dinuclear copper complexes enhanced catalytic activity, with chloride ions inhibiting the reaction.

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Area of Science:

  • Inorganic Chemistry
  • Catalysis
  • Biomimetic Chemistry

Background:

  • Copper complexes are widely studied for catalytic applications.
  • The oxidation of catechols is an important transformation in organic synthesis and biochemistry.
  • Designing efficient catalysts for catechol oxidation remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a library of Cu(II) complexes with varying ligands.
  • To investigate the catalytic activity of these complexes in the oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC).
  • To understand the structure-activity relationships governing the catalytic performance.

Main Methods:

  • Synthesis of a large library of Cu(II) complexes.
  • X-ray structure determination of selected complexes.
  • Catalytic oxidation assays using 3,5-DTBC as substrate.
  • Kinetic studies to determine reaction rates and inhibition effects.

Main Results:

  • Complexes with ligands stabilizing biomimetic dinuclear Cu(II) μ-thiolate structures showed enhanced catalytic activity.
  • The presence of chloride ions was found to inhibit the oxidation activity.
  • A highest turnover frequency (kcat) of 6900 h(-1) was achieved in acetonitrile (CH3CN).

Conclusions:

  • Ligand design plays a crucial role in the catalytic efficiency of copper complexes for 3,5-DTBC oxidation.
  • Biomimetic dinuclear copper complexes exhibit superior activity.
  • Chloride ions negatively impact the catalytic performance, suggesting careful control of reaction conditions is necessary.